紫色土丘陵坡地植被恢复过程中土壤微生物生物量碳、微生物熵的变化

Variations of Soil Microbial Biomass Carbon and Biological Information Entropy During Revegetation on Hillslope Land with Purple Soil

采用空间序列代替时间序列的方法,对河南省衡阳市紫色土丘陵坡地植被恢复过程中的土壤微生物生物量碳(SMBC)、微生物熵(qSMBC)的变化特征进行了研究。结果表明:(1)随着植被恢复的进行,SMBC和qSMBC均显著增加;(2)随着土层深度的增加,SMBC显著减小,而qSMBC显著增加;(3)草本群落阶段(Ⅱ)→灌木群落阶段(Ⅲ)→乔木群落阶段(Ⅳ),根际和非根际的SMBC显著增加,表现出根际>非根际的特点,阶段Ⅱ的根际与非根际SMBC比值明显高于Ⅲ与Ⅳ。根际和非根际的qSMBC均显著增加,表现出根际<非根际的特点,根际和非根际的qSMBC比值差异不显著;(4)相关分析表明,SMBC与qSMBC均与土壤有机碳、阳离子交换量呈极显著或显著正相关关系,与土壤容重呈显著负相关关系。

The properties of SMBC（soil microbial biomass carbon）,qSMBC（biological information entropy）during revegetation on hillslope land with purple soils in Hengyang City of Hunan Province were studied using the space for time method.The results showed that：（1）SMBC and qSMBCsignificantly increased from bare land（Ⅰ）,herbaceous community（Ⅱ）,shrubby community（Ⅲ）to arboreal community stage（Ⅳ）;（2）SMBC significantly decreased but qSMBCsignificantly increased from soil layer of 0—20cm,20—40cm to40—60cm;（3）From stageⅡ,ⅢtoⅣ,SMBC in R（rhizosphere）and S（non-rhizosphere）were significantly increased,and expressed the properties SMBCRSMBCS,SMBCR/SMBCSin stageⅡ was obviously higher than that in Ⅲ and Ⅳ.qSMBCRand qSMBCSsignificantly increased from stageⅡ to Ⅳ,and qSMBCRq〉SMBCS,but qSMBCR/qSMBCShad no significant difference;（4）Correlation analysis showed：SMBC and qSMBChighly or significantly positively correlated with soil organic carbon and cation exchange capacity（CEC）,and significantly negatively correlated with bulk density.