Under the condition of high temperature, the effects of five cover patterns （clean tillage, film mulching, weed covering, branches and leaves covering and growing grass covering） on soil properties in young Phoebe b...Under the condition of high temperature, the effects of five cover patterns （clean tillage, film mulching, weed covering, branches and leaves covering and growing grass covering） on soil properties in young Phoebe boumei forest were in- vestigated. The results showed that the five cover patterns all showed significant ef- fects on soil properties in young Phoebe bournei forest under the condition of high temperature. Land cover increased land temperature in Phoebe boumei forest. Un- der the film mulching, the land temperature was increased most rapidly with the largest increment. However, weed covering, branches and leaves covering and growing grass covering decreased land temperature. Among them, growing grass covering showed the best cooling effect. The film mulching, weed covering, branch- es and leaves covering and growing grass covering all increased land humidity. The film mulching showed the best moisture-preserving effect in the early period, but in the late period, the humidity in the film mulching treatment group was lower than that in the clean tillage treatment group. Among the five mulching patterns, moisture loss in the film mulching treatment group was slowest and least, followed by those in the weed covering and branches and leaves covering treatment groups, and moisture loss in the growing grass covering treatment group was fastest and most.展开更多
To determine whether reforestation efforts in the denuded hills have significant impacts on hydrology in the Xinjiang River watershed, the authors examined eight land-cover scenarios to compare hydrologic responses an...To determine whether reforestation efforts in the denuded hills have significant impacts on hydrology in the Xinjiang River watershed, the authors examined eight land-cover scenarios to compare hydrologic responses and to provide a conceptual basis for restoration practices. The authors analyzed a 17-year time period using remote sensing to develop land-cover classification for the watershed. Climate, soil and terrain data for the watershed were used as input in the SWAT （soil and water analysis tool） to quantify and compare the impacts on hydrologic processes. The model was calibrated to a two-year record of stream discharge measurements. The results show significant increase in forest-cover on hills （13%）. However, the hydrological response is not very significant considering the changes in forest-cover, the surface runoff and percolation ratios only changed by 2% and 1% over time. Installment of earthen irrigation ponds in the outlets of sub-basin with maximum runoff had provided the most significant hydrologic improvements and could provide irrigation water to increase crop yield on remaining cropland. The study will provide information to the local government to aid decision-making in sustainable reforestation programs resulting in better hydrologic functioning for sustainable water resource management.展开更多
基金Supported by Forestry Science and Technology Program of Hunan Province(XLK201406)~~
文摘Under the condition of high temperature, the effects of five cover patterns （clean tillage, film mulching, weed covering, branches and leaves covering and growing grass covering） on soil properties in young Phoebe boumei forest were in- vestigated. The results showed that the five cover patterns all showed significant ef- fects on soil properties in young Phoebe bournei forest under the condition of high temperature. Land cover increased land temperature in Phoebe boumei forest. Un- der the film mulching, the land temperature was increased most rapidly with the largest increment. However, weed covering, branches and leaves covering and growing grass covering decreased land temperature. Among them, growing grass covering showed the best cooling effect. The film mulching, weed covering, branch- es and leaves covering and growing grass covering all increased land humidity. The film mulching showed the best moisture-preserving effect in the early period, but in the late period, the humidity in the film mulching treatment group was lower than that in the clean tillage treatment group. Among the five mulching patterns, moisture loss in the film mulching treatment group was slowest and least, followed by those in the weed covering and branches and leaves covering treatment groups, and moisture loss in the growing grass covering treatment group was fastest and most.
文摘To determine whether reforestation efforts in the denuded hills have significant impacts on hydrology in the Xinjiang River watershed, the authors examined eight land-cover scenarios to compare hydrologic responses and to provide a conceptual basis for restoration practices. The authors analyzed a 17-year time period using remote sensing to develop land-cover classification for the watershed. Climate, soil and terrain data for the watershed were used as input in the SWAT （soil and water analysis tool） to quantify and compare the impacts on hydrologic processes. The model was calibrated to a two-year record of stream discharge measurements. The results show significant increase in forest-cover on hills （13%）. However, the hydrological response is not very significant considering the changes in forest-cover, the surface runoff and percolation ratios only changed by 2% and 1% over time. Installment of earthen irrigation ponds in the outlets of sub-basin with maximum runoff had provided the most significant hydrologic improvements and could provide irrigation water to increase crop yield on remaining cropland. The study will provide information to the local government to aid decision-making in sustainable reforestation programs resulting in better hydrologic functioning for sustainable water resource management.
