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通过对湘南丘陵区不同林分类型涵水保土效益的定位观测 ,分别对林地的产流量、产沙量、输沙率、最大涵水能力及保土效果进行了探讨 ,发现 :1CK坡面的地表径流系数比有林地的地表径流系数要大 1.0 4～ 1.2 1倍、林分质量越好的林地坡面的径流系数比林分质量较差的林地坡面的径流系数要小 ;2 CK坡面的产沙量、输沙率比有林地的产沙量、输沙率要大 2 .80～ 3.73倍、2 .5 8～ 3.2 6倍 ;林分质量越好的林地坡面的比林分质量较差的林地坡面的产沙量、输沙率要小 ;3湘南红壤区长江防护林的各种林分类型虽然还处于幼龄林阶段 ,但其林地的保土、涵水能力还是比较强的 ,其林地土壤的涵水能力为 CK的 1.5 6～ 3.0 8倍、保土能力在 386 0 t/ (km2 · a)～ 4 390 t/(km2 · a)之间
Through the observation and observation on the benefits of soil and water conservation and soil conservation of different forest types in the hilly region of southern Hunan, the runoff yield, sediment yield, sediment yield, maximum water bearing capacity and soil conservation effect of forest land were discussed. The results show that: 1CK slope Of runoff coefficient is 1.04 ~ 1.2 times larger than that of forest land. The runoff coefficient of woodland slope with better stand quality is smaller than runoff slope of woodland slope with poor quality; 2 CK Slope sediment yield and sediment transport rate than the forest of sediment yield, sediment transport rate to 2.80 ~ 3.73 times, 2.58 ~ 3.2 6 times; the better the quality of the forest slope than The yield and sediment yield of woodland slopes with poor stand quality are smaller. The types of the forest types in the Cheonjiang Protection Forest in Southern Hunan Red Soil Region are still in the young stage, but the soil conservation and water abstraction capacity of the forest land Is still relatively strong, and the water capacity of forest soil is 1.56-3.08 times of that of CK, and the soil conservation capacity is between 3860 t / (km2 · a) and 4390 t / (km2 · a)