侵蚀程度对不同粒径团聚体中养分含量和红壤有机质稳定性的影响  

EFFECT OF EROSION ON NUTRIENT CONTENT IN AGGREGATES OF DIFFERENT PARTICLE-SIZE FRACTIONS AND STABILITY OF ORGANIC MATTER IN ULTISOLS

作　　者：董雪[1] 王春燕[1] 黄丽[1] 谭文峰[1] 胡红青[1] 

机构地区：[1]华中农业大学农业部长江中下游耕地保育重点实验室,武汉430070

出　　处：《土壤学报》2013年第3期525-533,共9页Acta Pedologica Sinica

基　　金：国家自然科学基金项目(40971143);中央高校基本科研业务费专项基金(2012SC30)资助

摘　　要：以三种侵蚀程度的红壤(轻度、中度、严重)为供试材料,研究其>0.25 mm水稳性团聚体中的养分(全氮、全磷、全钾、有机质)和不同形态有机碳(易氧化态和难氧化态)的含量状况和分布特点。结果表明:随着红壤由轻度、中度到严重侵蚀的变化,>0.25 mm水稳性团聚体中有机质、全氮和全磷含量逐渐降低;>0.25 mm水稳性团聚体中的养分对土壤养分的贡献率为[>4 mm]>[0.5～1 mm]>[1～2 mm]>[2～4 mm]>[0.25～0.5 mm];侵蚀红壤的全氮、全磷和有机质均与>0.25 mm水稳性团聚体含量显著正相关。土壤有机碳、易氧化碳和难氧化碳的含量随着红壤侵蚀程度的增强逐渐降低,并且均与>0.25 mm水稳性团聚体、有机质、全氮、全磷呈极显著正相关。有机质氧化稳定性系数与不同粒径水稳性团聚体、土壤有机质、全氮和全磷均呈负相关。Contents and distributions of nutrients （total N, total P, total K and OM） and organic carbon of different forms （ ready-to-oxidize and hard-to-oxidize） in water-stable aggregates （ 〉 0.25 mm） in ultisols different in erosion degree （slight, medium and severe） were studied. Results show that with erosion aggravating, the contents of nutrients （OM, total N and total P） in water-stable aggregates （ 〉 0.25 mm） gradually decreased. In terms of contribution to the total of soil nutrients, various fractions of water-stable aggregated a sequence of [ 〉 4 mm ] 〉 [ 0.5 - 1 mm ] 〉 [ 1 2 mm] 〉 [2 -4 mm] 〉 [0.25 -0.5 mm]. The contents of total N, total P and OM were significantly and positively related to the content of 〉 0.25 mm water-stable aggregates. The contents of soil total organic carbon, readily-oxidation and hard-oxidation organic carbon took on a falling trend with the enhancing of erosion degree and had the marked positive correlation with 〉 0.25 mm water-stable aggregates, OM, total N and total P, while oxidation stability coefficient of organic matter was negatively related to the co.ntents of water-stable aggregates of various fractions, OM, total N and total P.

关 键 词：侵蚀红壤 养分 水稳性团聚体 易氧化碳 难氧化碳 有机质氧化稳定性 

分 类 号：S158[农业科学—土壤学]