张家界植烟土壤的有机无机复合状况及其与土壤养分的关系

用傅积平改进法测定了张家界植烟土壤的有机无机复合状况,并分析了其与土壤养分的关系.结果表明:腐殖质的结合形态主要以松结态和紧结态为主,稳结态腐殖质含量最少;土壤复合量与松结态腐殖质、紧结态腐殖质和有机质均呈极显著正相关,有机无机复合度仅与有机质呈显著负相关.3种结合态腐殖质中,松结态与土壤养分(全氮、全磷和有机质)的相关性最高,土壤全钾与腐殖质没有明显的相关性.松结态腐殖质主要是铁、铝键结合的腐殖质,稳结态腐殖质则主要是钙键结合的腐殖质.腐殖质不同形态与土壤pH值、阳离子交换量(CEC)、交换性钙、交换性镁、有效硫和有效铁之间都有着密不可分的联系.

Status of Organo-mineral Complex in Tobacco-growing Soil from Zhangjiajie City and Its Relationship with Soil Nutrients

Status of organo-mineral complex in the tobacco-growing soil from Zhangjiajie city was determined by FU Ji-ping modified method,and its relationship with soil nutrients was analyzed.The results showed that the combined humus form in soil mainly was tightly-combined form and loosely-combined formed,and the content of stably-combined humus was the least.The content of soil complexes was positively related to loosely-combined humus,tightly-combined humus and soil organic matter.There was a negative correlation between the organo-mineral complexing degree and soil organic matter.Among the three types of humus,loosely-combined humus was the most closely related to soil nutrients(total N,total P and organic matter).Loosely-combined humus mainly was Fe/Al-bound complex;and stably-combined humus mainly was Ca-bound complex.The different forms of humus all closely related to soil pH,cation exchange capacity(CEC),exchangeable calcium,exchangeable magnesium,available S and available Fe.