摘要
通过室内恒湿和干湿交替培养试验 ,研究了沈阳地区耕地棕壤和草甸土的固钾特征 ,及其施用有机肥后对土壤固钾作用的影响。结果表明 ,在保持土壤处于田间持水量的恒湿条件下 ,两种土壤对外源钾都能够产生快速固定作用 ,经过 1d培养土壤的固钾作用就可以达到平衡 ,但干湿交替培养可以提高土壤固钾量 2 6 80 %~ 33 2 7% ;土壤施用有机肥后 ,在恒湿和干湿交替培养条件下均可以降低土壤的固钾强度 ,其中 ,施用有机肥 6 %处理的恒湿培养 15d后 ,棕壤和草甸土的固钾量分别降低了 2 5 71%和 36 6 2 %。
The characteristic of K-fixation on farming brown soil & meadow soil in Shenyang area and the effect of organic manure application on K-fixation was studied with constant moisture at water holding capacity and wetting-drying incubation experiments.In all studies,483.72 mg K·kg -1 soil was applied before monitoring of K fixation.Results indicated that the process of fixation to extra-K was rapid in both of the two soils,and the fixation reaction reached equilibrium within 1 day on field capacity incubation. The K-fixation capacity can be increased by 26.80 %~33.27% with wetting-drying incubation compared to constant field capacity incubation.The power of K-fixation can be decreased by organic manure application with both kinds of incubation.The capacity of K-fixation decreased 25.71% and 36.62% on brown soil and meadow soil respectively after 15 days of wetting-drying incubation with 6% organic manure applied.
出处
《生态学杂志》
CAS
CSCD
北大核心
2004年第5期228-231,共4页
Chinese Journal of Ecology
基金
国家自然科学基金项目(40071052)
国家自然科学基金重点项目(20337010)
沈阳大学沈阳环境工程重点实验室基金资助项目(03001)。
关键词
有机肥
棕壤
草甸土
固钾作用
organic manure,brown soil,meadow soil,K-fixation.