黄土高原天然次生林植被演替过程中土壤团聚体有机碳动态变化  

Dynamics of soil aggregate⁃associated organic carbon during secondary forest succession in the Loess Plateau,China

作　　者：潘英杰 何志瑞 刘玉林 董凌勃 吕文文 上官周平[1,4] 邓蕾[1,2,4] PAN Yingjie;HE Zhirui;LIU Yulin;DONG Lingbo;LÜ Wenwen;SHANGGUAN Zhouping;DENG Lei(State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,China;University of Chinese Academy of Sciences,Beijing 100049,China;Lianjiabian Forest Farm,Ziwuling Forestry Administration,Heshui 745000,China;Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,China)

机构地区：[1]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100 [2]中国科学院大学研究生院,北京100049 [3]甘肃省子午岭林业管理局合水分局连家砭林场,合水745000 [4]西北农林科技大学水土保持研究所,杨凌712100

出　　处：《生态学报》2021年第13期5195-5203,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金面上项目(41877538);国家林业和草原局林草科技创新人才计划项目(20201326015)。

摘　　要：土壤团聚体物理保护是促进有机碳积累主要机制之一。以黄土高原子午岭林区天然次生林植被演替群落为对象,研究从农田、草地(白羊草,Bothriochloa ischaemum)、灌木林(沙棘,Hippophae rhamnoides)、先锋林(山杨,Populus davidiana)到顶级林(辽东栎,Quercus liaotungensis)5个植被演替阶段0—20 cm土壤团聚体稳定性和团聚体有机碳的动态变化,并分析团聚体有机碳的影响因素。结果表明:土壤团聚体稳定性随着植被演替显著提高(P<0.05),顶级林的团聚体稳定性最高;土壤有机碳含量和各粒径土壤团聚体(> 2 mm、2—0.25 mm、0.25—0.053 mm、<0.053 mm)有机碳含量均随着植被演替而增加。除草地0.25—0.053 mm团聚体有机碳含量最高外,其他演替阶段均为0.25—2 mm粒径最高。根系生物量、凋落物生物量、微生物生物量碳、团聚体稳定性均与团聚体有机碳含量呈显著正相关关系(P<0.05)。总体而言,长期植被演替有助于团聚体稳定性和团聚体有机碳累积。Vegetation restoration plays an important role in soil structure and nutrients.The effects of vegetation restoration on the aggregate stability and soil carbon storage have been widely studied,but the distribution of aggregate associated organic carbon and the effects of plants on aggregate associated organic carbon in the secondary forest succession are still unclear.This paper studied the stability of soil aggregates and the changes of soil aggregate⁃associated organic carbon under the succession sequence of the secondary forests in Ziwuling forest region of the Loess Plateau,China.We discussed the dynamics of aggregate⁃associated organic carbon and its influencing factors following the secondary forest succession.In the field investigation,five vegetation succession stages were selected:farmland(CL),grassland(GL),shrub(S),pioneer forest(PF),and climax forest(CF).Soil samples in 0—20 cm were collected and the aggregates were separated by wet sieving.The stability of aggregates was characterized by mean weight diameter(MWD),geometric mean diameter(GMD),and percentage of water stable aggregates(WAS).The organic carbon,root biomass,litter biomass and microbial biomass carbon(MBC)of soil and aggregates were measured.The dynamics of soil aggregate⁃associated organic carbon and its influencing factors were analyzed.The results showed that soil organic carbon contents increased with vegetation succession,which showed that CF>PF>S>CL,and the organic carbon contents of aggregates increased more significantly from grassland to pioneer arbor stage.The succession of vegetation communities significantly increased the content of soil organic carbon.The stability of soil aggregate increased significantly with vegetation succession(P<0.05).The stability of soil aggregate in climax forest was the highest,and the contents of macroaggregate>0.25 mm in pioneer forest and climax forest were higher than that in farmland.The organic carbon contents of soil aggregates with different particle sizes increased with vegetation suc

关 键 词：植被演替 团聚体 有机碳 黄土高原 

分 类 号：S714.2[农业科学—林学]