不同采伐剩余物处理方式对杉木幼林土壤活性有机碳的影响
首发时间:2019-02-21
摘要:福建三明格氏栲自然保护区40多年生杉木成熟林皆伐后,对采伐剩余物进行保留(Residue retained,RR)、清除(Residue removed,R)、火烧(Residue burnt,RB)处理,分别于2017年12月和2018年7月对不同采伐剩余物处理方式下种植的杉木幼林不同土层(0-10 cm和10-20 cm)土壤可溶性有机碳(Dissolved organic carbon, DOC)和微生物生物量碳(Microbial biomass carbon, MBC)进行分析,结果显示RR处理可以使土壤DOC与土壤MBC含量增加,同时在季节动态和不同采伐剩余物处理方式下二者变化规律相似。12月和7月RR处理0-10cm土层土壤DOC含量显著高于RB和R处理;而不同季节0-10 cm土层土壤MBC含量亦以RR处理的最高在10-20 cm土层RR处理12月和7月土壤DOC含量和MBC含量亦高于其他2种处理。3种处理0-10 cm土层土壤DOC和MBC含量均高于10-20 cm土层。除RB处理,其他处理2土层土壤DOC和MBC含量均表现为7月高于12月。
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Effects of harvest residue on soil labile carbon in Chinese fir plantation
Abstract:In this study, the effects of harvest residue management on soil dissolved organic carbon (DOC) and microbial biomass carbon (MBC) contents at soil layers of 0-10 cm and 10-20 cm were examined in December 2017 and July 2018 in a young Chinese fir plantation in the Castanopsis kawakamii Nature Reserve located in Sanming, Fujian China. The residue treatments included residue retained (RR), residue removed (R) and residue burnt (RB). The results showed that RR treatment could increase the contents of DOC and MBC in soil. Seasonal dynamics of soil DOC and MBC and their variations under different harvest residue treatments were similar. The DOC content in 0-10 cm soil layer of RR treatment in December 2017 and July 2018 respectively, which were significantly higher than those of RB and R treatments. Similarly, MBC content in 0-10 cm soil layer of RR treatment was highest. In 10-20 cm soil layer, soil DOC and MBC contents in the two months were also higher than those in other two treatments. For three residues treatments, soil DOC and MBC contents in 0-10 cm soil layer were all higher than those in 10-20 cm soil layer. Except for RB treatment, soil DOC and MBC contents in other two treatments were significantly higher in summer than those in winter.
Keywords: soil ecology dissolved organic carbon microbial biomass carbon
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不同采伐剩余物处理方式对杉木幼林土壤活性有机碳的影响
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