摘要
植物残体添加和去除试验(the detritus input and removal treatments,DIRT)作为一种研究碳输入来源变化对土壤质地与质量影响的试验设计,对研究土壤养分来源以及主要影响机制具有关键作用。选择福建省三明森林生态系统与全球变化研究站的米槠常绿阔叶天然林,设置对照(CT)、去除凋落物(NL)、去除根系(NR)、去除凋落物+去除根系(NI)、添加双倍凋落物(DL)5种处理,于2018年12月对各处理不同土层(0-10,10-20 cm)土壤进行取样,研究其土壤有机碳组分及其影响因子。结果表明:(1)在0-10 cm土层中,DL中NH_(4)^(+)-N与TN含量明显高于其他处理。NR处理的NH_(4)^(+)-N与DON含量显著大于NL与NI处理。在10-20 cm土层中,DL处理在NH_(4)^(+)-N、NO_(3)^(-)-N、DON以及TN含量显著大于其他处理。NI处理的NH_(4)^(+)-N含量显著低于其他处理。(2)DL处理有机碳含量显著高于NL处理,但DL处理土壤有机碳含量与CT处理无明显差异(P>0.05),其余各处理间差异均不显著。(3)含有凋落物的处理土壤活性碳组分含量显著高于去除凋落物处理,活性碳组分含量顺序为DL>CT>NR>NL>NI。去除凋落物处理(NL)土壤惰性碳组分含量显著高于去除根系处理(NL、NI)。(4)凋落物和根系的输入对0-10 cm土层土壤β-葡萄糖苷酶以及纤维素水解酶活性具有显著影响,呈现与土壤活性碳组分相同的变化趋势。冗余分析表明,土壤有机碳组分的变化主要是受控于β-葡萄糖苷酶。pH以及土壤含水率也是影响土壤有机碳及其组分的关键因子。凋落物的输入有利于提高土壤养分有效性以及土壤质地,加快碳循环;植物根系则对土壤中有机碳的稳定性具有关键作用。
The detritus input and removal treatments(DIRT),as an experimental design to study the effects of carbon input on soil texture and quality,plays a key role in the study of soil nutrient sources and main influencing mechanisms.In this study,the natural Castanopsis carlessii forest in the Sanming forest ecosystem and global change research station in Fujian province was selected,and five treatments were set up,including control(CT),no litter(NL),no roots(NR),no input(NI),double litter(DL),0-10 and 10-20 cm soil samples in each treatment were collected in december 2018 to study the soil organic carbon fractions and their influencing factors.The results showed that:(1)In the 0-10 cm soil layer,the contents of NH_(4)^(+)-N and total N(TN)in DL treatment were significantly higher than those in other treatments.The contents of NH_(4)^(+)-N and dissolved organic N(DON)in NR treatment were significantly greater than those in NL and NI treatment.In the 10-20 cm soil layer,the contents of NH_(4)^(+)-N,NO_(3)^(-)-N,DON and TN in the DL treatment were significantly greater than those in other treatments.The contents of NH_(4)^(+)-N in NI treatment was significantly lower than that in other treatments.(2)The contents of organic carbon in DL treatment was significantly higher than that in NL treatment,but there was no significant difference in soil organic carbon content between DL treatment and CT treatment(P>0.05),and there was no significant difference among other treatments.(3)The contents of active carbon fraction in the treatment with litter was significantly higher than that in the treatment without litter,and the order of active carbon fraction content was DL>CT>NR>NL>NI.The content of soil recalcitrant carbon in litter removal treatment(NL)was significantly higher than that in root removal treatments(NL and NI).(4)Litter and root input had significant effects on the activities ofβ-glucosidase and cellobiohydrolase in 0-10 cm soil layer,showing the same changing trend as soil active carbon.Redundancy analysis showed that the variation of soil organic carbon fractions was mainly controlled byβ-glucosidase activity.The pH value and soil moisture content were also key factors affected soil organic carbon and its fractions.Litter input was conducive to improve the availability of soil nutrients and soil quality,and accelerate the carbon cycle,while plant roots played a key role in the stability of organic carbon in the soil.
作者
张磊
贾淑娴
李啸灵
陆宇明
刘小飞
郭剑芬
ZHANG Lei;JIA Shuxian;LI Xiaoling;LU Yuming;LIU Xiaofei;GUO Jianfen(College of Geographical Science,Fujian Normal University,Fuzhou 350007;Key Laboratory of Humid Subtropical Eco-Geographical Processes,Ministry of Education,Fuzhou 350007)
出处
《水土保持学报》
CSCD
北大核心
2021年第3期244-251,共8页
Journal of Soil and Water Conservation
基金
福建省科技厅公益类重点项目(2019R1002-4)
福建省高等学校新世纪优秀人才支持计划项目(J1-1253)。
关键词
酸水解碳组分
酶活性
凋落物
根系
米槠天然林
acid-hydrolyzed carbon fraction
enzyme activity
litter
root system
natural forest of Castanopsis carlessii
