衡阳紫色土丘陵坡地5种土地利用方式土壤肥力综合评价

Comprehensive Evaluation on Soil Fertility of Different Land Use Types on Sloping-land with Purple Soils in Hengyang

【目的】为了研究衡阳紫色土丘陵坡地5种土地利用方式[自然恢复地(NR)、草地(GT)、灌草地(FG)、灌丛地(FX)和乔灌地(AF)]的土壤肥力质量差异。【方法】以不同土地利用方式的0~20与20~40 cm土层土壤为研究对象,通过主成分分析和相关分析方法选取具有代表性指标计算土壤肥力指数,对并土壤肥力进行综合评价。【结果】除全磷(TP)、全钾(TK)与速效钾(AK)外,不同土地利用方式的土壤肥力指标有明显差异性;土壤质量指数(SQI)计算结果表明,灌草地(1.62)与草地(1.59)土壤肥力最好,乔灌地(1.32)与灌丛地(1.03)次之,自然恢复地(0.59)最差。【结论】研究表明,在衡阳紫色丘陵坡地,灌草地(紫穗槐+白花草木樨)与草地(白花草木樨-猪屎豆)最有利于土壤肥力的提高。

【Objective】Research the differences of soil fertility quality among five land use types,including natural re-vegetation(NR),grassplot(GT),frutex and grassland(FG),frutex(FX)and arbor and frutex(AF)on sloping-land with purple soils in Hengyang of Hunan province.【Method】Taking the soils of 0~20 and 20~40 cm soil layers in five land use types as the research object,the typical norm was selected to calculate soil fertility index by the methods of principal component and correlation analysis,and the soil fertility was comprehensively evaluated.【Result】The results showed that apart from total phosphorus(TP),total potassium(TK)and available potassium(AK),there was obviously difference of soil fertility among five land use types;The soil quality index(SQI)showed that the soil fertility quality of FG(1.62)and GT(1.59)was the best,followed by AF(1.32)and FX(1.03),and that of NR(0.59)was the worst.【Conclusion】All the study indicated that FG(Amorpha fruticosa+Melilotus albus)and GT(Melilotus albus—Crotalaria pallid)were most beneficial to the improvement of the soil fertility on sloping-land with purple soils in Hengyang of Hunan Province.