气候因素对土壤有机质组成和性质的影响

COMPOSITION AND PROPERTIES OF SOIL ORGANIC MATTER LNFLUENCED BY CLIMATIC FACTORS

云南省哀牢山徐家坝自然保护区不同海拔的土壤有机质组成和性质与气候因素的相关分析结果表明，土壤有机质的组成（Ｈ／Ｆ），胡敏酸的光学特征（Ｅ＿４／Ｅ＿６）和ＣａＣｌ＿２的絮凝极限（ＦＬ值），除ＦＬ和Ｅ＿４／Ｅ＿６与年均降雨量不呈显著相关关系外，其它数值均与年均温、≥１０℃积温和年均降雨量呈显著（ｐ＜０．０１，ｎ＝７）的相关关系，并服从一元二次方程Ｙ＝Ａ＋ＢＸ＋ＣＸ￣２．由此证明了气候因素对土壤有机质组成和胡敏酸的性质有显著的影响。

Correlation an alysis was applied for climatic factors with different altitude composition andproperties of soil organic matter in Ailao Mountains′ Xujiaba Reserve in Yunnan,China.The results shows that soil humus compeition H/F ratio , humic acid optical properties E_4/ E_6 ratioand flocculation Limit(FL) of CaCL_2 have sig nificant correlation with annual mean temperatre(MT) ,total temperature≥10℃(TT)and annual mean precipitation iexcept H/F and E4/E_6 withMT(r=0.841 7&0.7593).The correlation sutable second-order equation Y=A+BX+CX￣2.H/Fhas the best correlation with(MT)and TT in all equations, the correlation coefficient cnaget 0.9840 and 0. 971 3,the significance P<0.001,n=7. Summary,1. Climate factors notonly influence soil humus composition but also humic aclti properties.2.H/F ratio,E_4/E_6 ratioand FL are all significance correlation with climate factors such as MT and TT,3.In some condi-tions,it can try to apply H/F ratio of some humus compeition as a spocial value to estimateweather condition in some area or acient time.