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晋西黄土区不同退耕年限刺槐林对土壤水分和养分的影响
韩国忠1, 于博威2,3, 刘高焕2, 刘庆生2, 冯九梁4, 赵忠贺2,3
1.山西省水土保持科学研究所, 山西 太原 030013;2.中国科学院 地理科学与资源研究所, 资源与环境信息系统国家重点实验室, 北京 100101;3.中国科学院大学, 北京 100049;4.山西省水利厅水土保持局, 山西 太原 030002
摘要:
[目的]探讨人工刺槐林植被恢复对土壤水分和养分的影响,为半干旱黄土丘陵区植被恢复与生态建设提供理论依据。[方法]选择山西省黄河中游典型黄土丘陵沟壑区的人工刺槐林为研究对象,评估不同退耕年限刺槐林地土壤水分和养分特征。[结果]刺槐林地能够有效改善土壤水分条件,尤其在造林初期,土壤有机质和全氮平均含量显著提高,且具有明显的表聚性;刺槐林地对浅层土壤水分和养分的改善作用较大,土壤水分在40 cm以上土层坑内平均水分比坑外提高了3.97%,在40 cm以下土层仅提高了2.74%;土壤养分在20 cm以上土层,坑内土壤有机质、全氮、全磷和全钾平均含量分别比坑外提高了6.61%,6.14%,1.55%和1.98%;在20 cm以下土层,对土壤全磷和全钾无明显改善作用。[结论]刺槐林地不同程度地改善和提高了于浅层坑内土壤水分和养分状况。
关键词:  黄土丘陵区  刺槐  土壤水分  土壤养分  等高大坑
DOI:10.13961/j.cnki.stbctb.2018.05.003
分类号:S152.7;158.3
基金项目:中国科学院资源与环境信息系统国家重点实验室自主研究项目“黄土丘陵沟壑区综合实验基地建设”(08R8A010YA)
Effects of Robinia Psedudoacia Vegetation Restoration on Soil Moisture and Nutrient in Loess Hilly Region of Western Shanxi Province
HAN Guozhong1, YU Bowei2,3, LIU Gaohuan2, LIU Qingsheng2, FENG Jiuliang4, ZHAO Zhonghe2,3
1.Institute of Soil and Water Conservation of Shanxi Province, Taiyuan, Shanxi 030013, China;2.State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;3.University of Chinese Academy of Sciences, Beijing 100049, China;4.Soil and Water Conservation Bureau of Shanxi Water Conservation Department, Taiyuan, Shanxi 030002, China
Abstract:
[Objective] To explore the effects of Robinia psedudoacia plantations on the soil moisture and nutrient characteristics, in order to provide theoretical basis for vegetation restoration and ecological reconstruction in semiarid loess hilly region.[Methods] Based on data collected from soil sampling in the field and laboratory measurement, the soil moisture and nutrient characteristics under different R. psedudoacia plantations with various ages were analyzed in the loess hilly region of western Shanxi Province.[Results] R. psedudoacia plantanations effectively improved soil moisture conditions, especially in the early stages of the planting. The average content of soil organic content and total nitrogen increased significantly, and showed an apparent surface aggregation. Surface soil moisture and nutrient conditions were better than that of the underlying soil layers after R. psedudoacia restoration. Soil moisture inside the pits above 40 cm was 3.97% higher than that outside the pits, and 2.74% higher in soil below 40 cm. Soil organic content, total nitrogen, total phosphorus and total potassium inside the pits was increased by 6.61%, 6.14%, 1.55% and 1.98% respectively, than those outside the pit at 0-20 cm soil layer, while there were no significant improvements for the total phosphorus and the total potassium content below 20 cm soil layer.[Conclusion] R. psedudoacia plantanations has improved moisture and nutrients conditions in surface soil layers.
Key words:  loess hilly region  Robinia psedudoacia  soil moisture  soil nutrient  contour pit