Sediment retention, as an important regulating service, significantly impacts on agricultural productivity, flood control, pollutant transport and reservoir hydropower production.]Guizhou Pronvince of China is conside...
详细信息
Sediment retention, as an important regulating service, significantly impacts on agricultural productivity, flood control, pollutant transport and reservoir hydropower production.]Guizhou Pronvince of China is considered one of vulnerable regions suffering from serious soil *** recent two decades, climate and land use underwent an obvious change, thereby produced a profound influence on sediment ***, we evaluated the impacts of climate and land use change on the sediment retention in Guizhou using the Integrated Valuation of Environmental Services and Tradeoffs (InVEST) *** for the study area suggest that the amount of sediment retained and sediment exported experienced a great fluctuation from 1990 to 2010 due to a dramatic climate change, and will continuously increase by 2020 under three different scenarios due to the increase of natural vegetation affecting by the Grain—to—Green ***, the change in spatial pattern of sediment retained and sediment exported also reflected the impacts of climate and land use *** addition, the amount of sediment retained and sediment exported were highly sensitive to rainfall erosivity coefficient, soil erodibility coefficient, digital elevation model, flow threshold,crop—management factor and support practice factor for shrub land, grassland and arid *** method for sensitivity analysis in this study will contribute to the similar study in other countries and *** results of this study can provide explicit spatial information for land, water and reservoir managers to reduce the damages and costs associated with sedimentation.
Sediment retention, as an important regulating service, significantly impacts on agricultural productivity, flood control,pollutant transport and reservoir hydropower production. ]Guizhou Pronvince of China is conside...
详细信息
Sediment retention, as an important regulating service, significantly impacts on agricultural productivity, flood control,pollutant transport and reservoir hydropower production. ]Guizhou Pronvince of China is considered one of vulnerable regions suffering from serious soil erosion. In recent two decades, climate and land use underwent an obvious change, thereby produced a profound influence on sediment retention. Thus, we evaluated the impacts of climate and land use change on the sediment retention in Guizhou using the Integrated Valuation of Environmental Services and Tradeoffs(In VEST) model. Results for the study area suggest that the amount of sediment retained and sediment exported experienced a great fluctuation from 1990 to 2010 due to a dramatic climate change, and will continuously increase by 2020 under three different scenarios due to the increase of natural vegetation affecting by the Grain—to—Green project. Similarly, the change in spatial pattern of sediment retained and sediment exported also reflected the impacts of climate and land use change. In addition, the amount of sediment retained and sediment exported were highly sensitive to rainfall erosivity coefficient, soil erodibility coefficient, digital elevation model, flow threshold,crop—management factor and support practice factor for shrub land, grassland and arid land. The method for sensitivity analysis in this study will contribute to the similar study in other countries and regions. The results of this study can provide explicit spatial information for land, water and reservoir managers to reduce the damages and costs associated with sedimentation.
With SPOT—NDVI data and land use classification data, a remote sensing inversion was performed on multiple cropping index(MCI)in 2000, 2005 and 2010 in the Bohai Rim in China and the factors influencing multiple—cro...
详细信息
With SPOT—NDVI data and land use classification data, a remote sensing inversion was performed on multiple cropping index(MCI)in 2000, 2005 and 2010 in the Bohai Rim in China and the factors influencing multiple—cropping index change were explored quantitatively with a geographical detector methods model. The results showed that the multiple—cropping index from south to north reduced from 285% in plains to 75% in mountains, showing latitudinal zonality, and the multiple—cropping index was lower(35%—55%) in hills, plateaus and mountains than in plains at the same latitude, showing vertical zonality, because of the different hydrothermal conditions. During 2000—2005, the multiple—cropping index rose in plain areas, but declined in plateaus, mountains and hills. During 2005—2010, in contrast, the declined MCI started increasing, and the index in plains kept stable. It is concluded that the grain yield per unit area is a dominant factor influencing multiple—cropping index change, followed by cultivated land area per capita, labor force transfer rate and number in rural areas, agricultural production condition, agricultural modernization level, as well as geographical location. With rural—urban transition development, the subjects engaging in agricultural production are weakening. In plain regions, it is necessary to promote rural land circulation in a rational and well—organized way to develop new—type agricultural cooperative association and facilitate agricultural modernization. On the other hand, it is of significance to organize comprehensive consolidation and improvement including land, water, road, forest and villages, to strengthen high—standard farmland construction and guarantee regional grain safety and urban—rural transition development. In hills and plains, it is recommended to develop characteristic agriculture according to local conditions, adjust agricultural structure properly, and strengthen competitiveness of characteristic industries, so as to improve
暂无评论