不同经营措施对毛竹林碳储量及碳分配影响

以无经营毛竹纯林为对照(Ⅰ),以垦复(Ⅱ)、施用除草剂(Ⅲ)、劈草毛竹纯林(Ⅳ)为研究对象,研究不同经营措施对毛竹林碳储量及碳分配影响,结果表明:(1)与对照相比,垦复、施用除草剂、劈草均增加了植被层碳储量;各林分植被碳储量分别为30.98、33.04、33.19、31.21 t/hm2,地上乔木层碳储量占主体,分别为23.68、25.01、26.34、25.21 t/hm2。(2)施用除草剂增加毛竹林生态系统碳储量及土壤碳储量,垦复、劈草降低了毛竹林生态系统碳储量和土壤碳储量;毛竹林生态系统碳储量分别为113.15、98.13、131.90、112.59 t/hm2,土壤碳储量占主体,分别为86.17、65.09、98.71、80.39 t/hm2。(3)毛竹林植被碳素(CO2)年固定量分别为9.33、11.29、9.94、9.95 t/(hm2.a),相当于固定CO234.21、41.38、36.47、36.48 t/(hm2.a),地上乔木层碳固定量的增加是毛竹林植被碳素年固定量增加的主要原因。

Effect of Different Managements on Carbon Storage and Carbon Allocation in Moso Bamboo Forest(Phyllostachys pubescen)

Carbon storage in forest ecosystems is a basic parameter to predict the carbon exchange between forest ecosystems and atmosphere,and it plays a critical role in mitigating global climate change.The fast-growing and expanding growing area of Moso bamboo indicate that its carbon storage is increasing.Application of management in Moso bamboo forest is one of the most important measures to improve yield,thus,in this research,pure Moso bamboo forest with no management was selected as the control(Ⅰ) and managements of reclamation(Ⅱ),herbicide application(Ⅲ) and grass-chopping(Ⅳ) forests were selected as research stand.The carbon stock and allocation were analyzed and the results showed:(1) Compared with control stand,managements of reclamation,herbicide application and grass-chopping increased vegetational carbon stock;total vegetational carbon stock were 30.98,33.04,33.19,31.21 t/hm2,respectively,and aboveground carbon storage was the main part,which explained by 23.68,25.01,26.34 and 25.21 t/hm2.(2) Herbicide application increased both ecosystem carbon storage and soil carbon storage,however,management of reclamation and grass-chopping decreased both ecosystem carbon storage and soil carbon storage.Ecosystem carbon storage of each stand was 13.15,98.13,131.90 and 112.59 t/hm2,and soil carbon stock was the main part with an amount of 86.17,65.09,98.71,80.39 t/hm2.(3)The annual carbon sequestration of each stand was 9.33,11.29,9.94,9.95 t C(hm2·a),equaling to 34.21,41.38,36.47,36.48 t CO2/(hm2·a).Application of management in Moso bamboo forest could increase vegetation carbon sequestration.