摘要
为探讨大兴安岭地区顶级植被和次生植被土壤活性有机碳库的差异,以兴安落叶松林与白桦林为研究对象,对其生长季内土壤活性有机碳质量分数及其分配比例进行研究。结果表明:不同森林类型土壤易氧化有机碳、轻组有机碳、颗粒有机碳质量分数均随土层深度增加递减。在土层深度(d) 0<d≤5 cm、5 cm<d≤10 cm的土层,兴安落叶松林土壤活性有机碳质量分数在生长季初、末期均高于白桦林。兴安落叶松林各活性有机碳质量分数呈生长季初、末期高,旺期低的特征,且不同土层生长季动态较为一致;白桦林各活性有机碳质量分数在8月较高。兴安落叶松林和白桦林土壤易氧化有机碳分配比例分别为7.76%～24.03%,10.56%～22.57%;轻组有机碳分配比例分别为11.38%～52.38%,10.88%～55.74%;颗粒有机碳分配比例分别为12.54%～52.77%,11.83%～53.05%。各活性有机碳间及其与土壤总有机碳、全氮、碳氮比均达到极显著相关(P<0.01),与p H呈显著负相关,兴安落叶松林各活性有机碳对土壤含水率的响应高于白桦林。在生长季末期,兴安落叶松林土壤各活性有机碳均存在积累的过程,而白桦林则不同;在生长季旺期,兴安落叶松林土壤各活性有机碳质量分数要低于白桦林,且分配比例也较白桦林低。可以认为,兴安落叶松林对土壤碳库的积累相比白桦林较好。
In order to study the difference of soil active organic carbon pool between top vegetation and secondary vegetation in Daxing’an Mountains,the content and proportion of soil active organic carbon in Larix gmelinii forest and Betula platyphalla forest were measured. The contents of easily oxidized organic carbon( EOC),light fraction organic carbon( LFOC) and particulate organic carbon( POC) decreased with the increase of soil depth. In 0-5 cm and 5-10 cm soil layers,the soil active organic carbon content of L. gmelini forest was higher than that of B. platyphalla forest at the beginning and the end of growing season. The active organic carbon contents of L. gmelinii forest were high at the beginning and the end of growing season,and low in peak period,the dynamics of different soil layers were the same,and the active organic carbon content of B. platyphalla forest was higher in August. In L. gmelinii forest and B. platyphalla forest,the proportion of easily oxidized organic carbon was 7.76%-24.03% and 10.56%-22.57%,the proportions of light fraction organic carbon were 11.38%-52.38% and 10.88%-55.74%,and the proportions of particulate organic carbon were 12.54%-52.77%and 11.83%-53.05%,respectively. There was significant correlation between active organic carbon and soil total organic carbon,total nitrogen,carbon to nitrogen ratio( P<0.01),and negative correlation with p H. The response of each active organic carbon to soil moisture content in L. gmelinii forest was higher than that in B. platyphalla forest. At the end of growing season,there was a process of accumulation of soil active organic carbon in L. gmelinii forest,but not in B. platyphalla forest. At the peak of growing season,the content of soil active organic carbon in L. gmelinii forest was lower than that in B. platyphalla forest,and the proportion of L. gmelinii was also lower than that in B. platyphalla forest. Therefore,L. gmelinii forest is more conducive to soil carbon pool accumulation than B. platyphalla forest.
作者
李书杨
满秀玲
魏红
Li Shuyang;Man Xiuling;Wei Hong(Northeast Forestry University, Harbin 150040, P. R. China)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第12期64-70,共7页
Journal of Northeast Forestry University
基金
国家自然科学基金项目(31770488)
关键词
大兴安岭
兴安落叶松林
白桦林
土壤活性有机碳
Daxing’an Mountains
Larix gmelinii
Betula platyphalla
Soil active organic carbon
