In the individual development of each individual, its genetic program is embodied. Ontogenetic or age-related changes include all aspects of development: metabolic processes, organogenesis, reproduction, aging or rejuvenation.Comprehensive land improvement in the whole region can effectively protect cultivated land resources, realize centralized contiguous cultivated land, and thus carry out large-scale management of rural cultivated land, accelerate the pace of agricultural modernization, improve rural ecological environment, and promote the development and construction of green villages in China, which plays a vital role in the coordinated development of urban and rural areas in China. The remediation of inefficient garden land and defective forest land is one of the important remediation types in the comprehensive land remediation of the whole region, the research on the remediation potential of inefficient garden land and defective forest land can effectively broaden the ways of supplementing cultivated land, provide strong support for solving the problem of balance between occupation and compensation of cultivated land , and have extremely important significance for promoting the scientific development of land resources in China and improving the use value of land resources. At present, there are many researches on the analysis of land remediation potential , for example, Li Quanbao discussed the key problems and suggestions in the development of garden land and defective forest land as new cultivated land sources on the basis of exploring the development practice of garden land and defective forest land , Jiang Changsheng explored some methods about the development of remediation potential of garden land and defective forest land, which provided methodological guidance for the analysis of remediation potential of inefficient garden land and defective forest land .
Li Quanbao focused on the problems encountered in the actual development of garden land and defective forest land, while Jiang Changsheng only studied the technical methods needed for the development of garden land and defective forest land. Neither scholar discussed the problems and methods together. In this paper, analytic hierarchy process is used to analyze the remediation potential of inefficient garden land and defective forest land in Zhemu Town, not only the technical methods but also the remediation potential were studied, nft growing system it is suggested that the local people’s government can make reasonable arrangements for the land remediation project in Zhemu Town with reference to the analysis results and the wishes of the villagers, so as to contribute to improving the income of the villagers in Zhemu Town, promoting the coordinated development of economy, society and ecology in the project area, and realizing the rural revitalization strategy in China.It is not only necessary but also urgent to renovate inefficient orchards. By selecting suitable crops and improving planting methods according to local conditions, the output of orchards can be effectively improved, and it is also conducive to improving the living standards and happiness of local villagers. Using ArcGis10.3 analysis and calculation, the total area of remediation area of low-efficiency garden in Zhemu Town is 785.62 hectares, of which the first-class potential area covers an area of 394.19 hectares, accounting for 50.17% of the total area of remediation area of low-efficiency garden; The secondary potential area covers an area of 305.65 hectares, accounting for 38.91%; the third-level potential area covers an area of 61.84 hectares, accounting for 7.87%; the fourth-level potential area covers an area of 23.94 hectares, accounting for 3.05%. The remediation potential of low-efficiency garden in Zhemu Town is mainly the first-class potential area and the second-class potential area, while the third-class potential area and the fourth-class potential area are small .
From the potential distribution map of inefficient garden in Zhemu Town , it can be seen that the primary and secondary potential areas of remediation potential in Zhemu Town are concentrated, mainly distributed in the central and western parts of Zhemu Town and the southeast, and sporadically distributed in the northern region; the third and fourth potential areas are mainly distributed in the south of Zhemu Town and a few in the southeast. The reason for this situation is that the Lijiang River passes through the north of Zhemu Town, the Xiangsi River, a tributary of the Lijiang River, flows through the central and western parts of Zhemu Town from northeast to southwest, and there is Baizhujing Reservoir in the southeast, which makes the water resources in the north, central and western parts of Zhemu Town abundant; moreover, the farmland infrastructure in the central and western parts of Zhemu Town is relatively perfect and the traffic conditions are good, and the slope in the central and western parts of Zhemu Town is relatively low, which makes the inefficient garden remediation potential in the central and western parts of Zhemu Town great; because the distribution of inefficient gardens in northern China is less, the first and second potential areas are only sporadic; the steep slope in the middle and east of Zhemu Town makes the renovation potential of inefficient garden in the middle and east of Zhemu Town small. It is suggested that the government of Zhemu Town can refer to the research results and combine the wishes of local villagers to scientifically arrange inefficient garden remediation projects, and should focus on remediation of inefficient gardens in the central, western and southeastern regions of Zhemu Town.Defective forest land refers to forest land which is destroyed by natural or human intervention, with low coverage rate, low economic value and low ecological value. The development and remediation of defective forest land will effectively improve the quality of local cultivated land, enhance the economic value of land, increase the income of villagers, and maintain and adjust the local ecological environment. According to the analysis and calculation of ArcGis10.3, the total area of remediation area of residual forest land in Zhemu Town is 1002.94 hectares, of which the first-class potential area covers 554.27 hectares, accounting for 55.27% of the total area of remediation area of residual forest land; the secondary potential area covers an area of 289.65 hectares, accounting for 28.88%; The third-level potential area covers an area of 54.88 hectares, accounting for 5.47%; the fourthlevel potential area covers an area of 104.14 hectares, accounting for 10.38%.
The largest potential area of low-efficiency garden remediation in Zhemu Town is the first-class potential area, followed by the second-class potential area, the fourth-class potential area again, and the third-class potential area is the smallest . From the potential distribution map of defective forest land in Zhemu Town , it can be seen that the primary and secondary potential areas of remediation potential in Zhemu Town are concentrated, mainly distributed in the northern, central and western regions of Zhemu Town and the southeast region; the third-level potential areas are scattered in Zhemu Town, while the fourth-level potential areas are mainly distributed in the south and southeast border areas of Zhemu Town. The reason for this situation is that the Lijiang River passes through the north of Zhemu Town, Xiangsi River, a tributary of Lijiang River, flows through the central and western parts of Zhemu Town from northeast to southwest, there is Baizhujing Reservoir in the southeast, which makes the water resources in the north, midwest and southeast of Zhemu Town abundant. In addition, in the north, vertical hydroponic nft system central and western regions of Zhemu Town, the farmland infrastructure is relatively perfect, the traffic accessibility is good, the slope in the central and western regions is relatively low, and the distribution of residual forests in the northern region is relatively concentrated, which makes the first-class potential area in the north of Zhemu Town the widest distribution and the greatest remediation potential, followed by the central and western regions and the southeast region; the southern and central eastern parts of Zhemu Town have a large slope and high terrain, which makes the remediation potential of the defective forest land in the central and eastern parts of Zhemu Town small. In the southeast boundary of Zhemu Town, it is mainly a four-level potential area with small remediation potential due to its far distance from the water source and large slope. It is suggested that the government of Zhemu Town can refer to the research results and combine the wishes of local villagers to scientifically arrange the remediation projects of defective forest land, and should focus on the remediation of defective forest land in the north, central and western regions of Zhemu Town, especially the defective forest land concentrated in the north.This is because climate is multivariate and ecological transitions and transformations are all related to climate. However, the rapid change in the global climate may cause unprecedented disruption of the biological processes. One of the implications of a novel shift in the climate system is that species may currently or in the future be relegated to climates that are sub-optimal for growth and survival. Also, shrinkage in the coverage of the boreal forest and extinction of some important members of the forest is anticipated. Boreal forest is an important component of the global carbon sink system that is sensitive to temperature. There are predictions concerning the migratory pattern of trees in response to climate change. However, some of the predictions were made from coarse scale observations which may not take into consideration the intraspecific genetic responses. Some tree species comprises of populations that are physiologically attuned to different climates. In addition, there are factors other than climate that may influence the migratory pattern of a species. It is therefore important to assess trees’ responses at individual species level. One proposed strategy to offsetting potentially negative impacts of climate change on forest systems is to match genotypes with the future climates. This idea is based on the provenance trials traditionally used to introduce seed sources to a new climate.
The provenance trials have been combined with a statistical model to predict species response to climate change . The underlying hypothesis for the model is that geographic variables are surrogate for elusive climate that governs micro-evolution and adaptation at local scale. However, the resulting predictions are often complex. In addition, implementing this approach requires a long-term provenance study and populations are necessarily planted in multiple sites. With the bourgeoning availability of climate data, climate-transfer function was developed to estimate the climatic distance to which populations may be transferred. It is based on the view that organismal distributions are primarily controlled by climate with other factors being secondary. Its advantage is that populations may not necessarily be planted in more than one site to generate a reliable result. This approach has been popularly used to assess species level response to climate change. In this paper, we present preliminary data of a study where we used transfer functions to assess the transferability of 25 populations of white birch to a test site in Northern Ontario. White birch is a widely distributed species in North America and the most prevalent of all the birches. It is an ecologically important hardwood species in the Canadian boreal forest. There is a rising commercial interest in its products and its inclusion in hardwood-conifer stand management. Although there is an increased silvicultural knowledge base for the species, information about local populations, transfer potentials and climatic guidelines for its transfer in order to take advantage of its genetic diversity is still limited. Previous studies have reported variations in climatic response between seed sources from its southern and northern limits. The northern seed sources appear to germinate at low temperatures compared with the southern sources. Such variation has been reported for some other temperate species but caution is sounded against any generalization without first testing the seed sources in a uniform environment . So far, no such testing exists for white birch. Although one seed source testing of white birch was done, the sources used in the study and the test sites were only restricted to the interior of British Columbia. The objective of this study was to investigate how variations in seed source determine the success of white birch in the field and to understand the underlying climatic factors that may influence the transfer potential of the species. In this study we were able to directly relate the influence of the seed sources to the outcomes of the transfer functions.What is striking in this study is the direct relationships between the greenhouse growth performances and the first year field data, especially the correlation between the initial height and survival. Indeed, seedling growth investment guarantees survival and it may also be a requisite for resource acquisition and resource balance of seedlings.