为了研究CSLE模型中T因子的确定方法,收集并筛选了关于全国各水土保持区不同保护性耕作措施与传统耕作相比减少侵蚀的研究成果,利用文献统计的方法,计算并得出了我国6种保护性耕作措施在6个水土保持区的T因子取值。结果 表明:(1)东北黑土区免耕秸秆覆盖、等高耕作和垄作区田3种保护性耕作措施下,T因子分别为:0.20±0.14,0.52±0.25,0.15±0.12;(2)北方土石山区免耕、垄作区田和等高耕作+植物篱3种保护性耕作措施下,T因子分别为:0.51±0.25,0.46±0.24,0.17±0.09;(3)西北黄土高原区免耕、免耕秸秆覆盖和等高耕作3种保护性耕作措施下,T因子分别为:0.73±0.17,0.69±0.22,0.27±0.22;(4)南方红壤区免耕秸秆覆盖和等高耕作2种保护性耕作措施下,T因子分别为:0.11±0.08,0.54±0.32;(5)西南紫色土区免耕秸秆覆盖、等高耕作、等高耕作+植物篱和聚土免耕4种保护性耕作措施下,T因子分别为:0.44±0.29,0.48±0.27,0.47±0.24,0.32±0.15;(6)西南岩溶区免耕和等高耕作2种保护性耕作措施下,T因子分别为:0.49±0.33,0.38±033。由此可知,在同一水土保持区,不同耕作方式的T因子取值不同,相同的水土保持耕作措施在不同的水土保持区的T因子取值也有较大差异。
In order to study the method of determining the T factor in the CSLE model, the results of different conservation farming measures in various soil and water conservation areas were collected and selected in China, the T-factor values of 6 conservation tillage measures in 6 soil and water conservation areas in China were calculated and obtained by using the literature statistics method. The results showed that:(1)under the 3 conservation tillage measures of no tillage with mulch, contour tillage, and micro-basins tillage in the black soil region of Northeast China, the T factors are 0.20±0.14, 0.52±0.25, 0.15±0.12, respectively;(2)under the 3 conservation tillage measures of no tillage, micro-basins tillage and contour tillage with hedgerow in the mountainous region of North China, the T factors are 0.51±0.25, 0.46±0.24, 0.17±0.09, respectively;(3)under the 3 conservation tillage measures of no tillage, no tillage with mulch and contour tillage in the Loess Plateau region of Northwest China, the T factors are 0.73±0.17, 0.69±0.22, 0.27±0.22, respectively;(4)under the 2 conservation tillage measures of no tillage with mulch and contour tillage in the red soil region of South China, the T factors are 0.11±0.08 and 0.54±0.32, respectively;(5)under the 4 conservation tillage measures of no tillage with mulch, contour tillage, contour tillage with hedgerow, and collecting soil to form ridge with no tillage in the purple soil region of Southwest China, the T factors are 0.44±0.29, 0.48±0.27, 0.47±0.24, 0.32±0.15, respectively;(6)under the 2 conservation tillage measures of no tillage and contour tillage in the Southwest China karst region, the T factors are 0.49±0.33 and 0.38±033, respectively. It can be seen that different farming methods have different T factors in the same soil and water conservation area, and the same soil and water conservation tillage measures have different values in different soil and water conservation areas. This study can provide the scientific basis for the values of T factor of different conservation tillage measures in different soil and water conservation areas in the application of CSLE model.
