They expressed the meaning that spatial heterogeneity of agricultural productivity was predominantly controlled by the topographic conditions at a decadal scale. At the same time it also confirms the fact that karst ecosystems have low biological productivity. That means for producing the same quality and quantity of agricultural products farmers in the karst region have to pay more both in terms of labour and time. The extremely fragile karst ecosystem is damaged by this in appropriate land use and the result is serious soil erosion on the sloping fields, water pollution in groundwater and down stream,and finally, irreversible ecological degradation. Therefore, could we say that the karst mountain regions are not a place to provide food for people? In fact we know that karst mountain regions are not grain-producing areas in China, stackable planter but the Chinese people traditionally want to grow their own crop and rarely consider any other trade, thus they become farmers also in less suitable areas.
Therefore we need to find another way to make sustainable development for both nature and society in the karst region. This means that the alternatives to the present land-use must be attractive to the farmers, not least in terms of money. We believe our EC model fulfil that requirement.According to our study, if all sloping land is changed to forest, the economic value of the ecosystem services would increase 2.57 times. These ecosystem services would not only benefit the local people but also those living downstream along the Pearl and Yangtze rivers. The services of ecological systems and the natural capital stocks that produce them are critical to the functioning of the earth’s life support system .Costanza et al. also stressed that it is not particularly meaningful to ask how large the total value of the natural capital is to human welfare. The question is instead how changes in the quantity or quality of various types of natural capital and ecosystem services may impact human welfare.
The Chinese Central Government has been trying to compensate the loss of income to farmers for conservation of the environment through the implementation of projects such as NFPP and SLCP . According to SLCP’s compensation standard, if one farmer gives up all his fields then he would get 189 yuan∙a−1. At the same time there are some local government’s grants for them. Everyone in the karst mountain regions of Guizhou would get1000 yuan∙a−1 for developing planting or breeding from 2014 to 2016. And at the end of 2016, 6 million of the poorest people in Guizhou will each get the compensation of 1000 yuan from the local government. Nevertheless,vertical grow rack it is difficult for them to get enough food and clothing. Obviously farmers need additional compensation to escape poverty, and only then could they gain the possibility to achieve sustainable development. In fact some countries have been focusing on ecological compensation as a method to solve the environmental problem or to preserve the ecosystems that provide the services .Zheng and Kou stressed that EC in River Basin is one of the important means to settle water resource conflicts between upstream and downstream villages, and they established an EC mode scheme in the Beijing water source areas.
Li and Sun put forward that EC has an important function in coordinating trans-regional resources and reallocating benefits. We believe that EC in the karst region could also achieve this function.That means EC not only provides money for improving the present living standard, but also a changed lifestyle and a build-up of sustainable industries, so we build a EC mechanism for 20 years to achieve sustainable development during which the proportion of EC will change . During these 20 years we assume that the new industry will have developed. Thus, after20 years the villagers will no longer be dependent on EC.During the 20 years, funding of EC would come from financial institutions at all levels of government, downstream enterprises of Pearl River, and eco-tax . However, all the funding should be collected by the government and supervised by the third part. The main obligations of the third part are to monitor the changes of environment, economy and society, track the process of the EC program, evaluate the execution of the contract between part A and part B and to provide suggestions at any time.