Understory vegetation management affected greenhouse gas emissions and labile organic carbon pools in an intensively managed Chinese chestnut plantation
Understory vegetation management affected greenhouse gas emissions and labile organic carbon pools in an intensively managed Chinese chestnut plantation
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DOI：
10.1007/s11104-013-1996-2
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发表时间：
2014-03
期刊：
影响因子：
4.9
通讯作者：
Jiaojiao Zhang;Yongfu Li;Scott X. Chang;Peikun Jiang;Guomo Zhou;Juan Liu;Jia-sen Wu;Zhen Shen
中科院分区：
文献类型：
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作者：
Jiaojiao Zhang;Yongfu Li;Scott X. Chang;Peikun Jiang;Guomo Zhou;Juan Liu;Jia-sen Wu;Zhen Shen
背景和目的控制或替代林下植被是常见的人工林管理措施，对土壤C库和温室气体（包括CO2、ch4和N2O）排放的影响了解甚少。本文旨在研究林下植被管理对亚热带板栗集约经营人工林土壤温室气体排放和活性碳库动态的影响。方法通过为期12个月的田间试验，研究了控制（control）、去除林下植被（UR）和苜蓿（medicago sativaL）替代林下植被4种不同林下植被管理方式下板栗人工林土壤活性碳库和温室气体排放的动态变化。（MS），用多年生草代替。(LP)。采用静态室/气相色谱技术测定土壤温室气体排放量。结果林下管理未改变土壤温室气体排放的季节格局；但与对照相比，UR处理增加了土壤co2和N2O排放量和ch4吸收量，MS和LP处理增加了土壤co2和N2O排放量，减少了土壤ch4吸收量（各处理效果P< 0.05，下同）。对照处理、UR处理、MS处理和LP处理的温室气体排放的全球变暖潜势（GWP）分别为36.56、39.40、42.36和42.99 Mg co2当量（CO2-e） ha - 1年−1，无论林下管理处理如何，co2排放占总GWP的95%以上。MS和LP处理增加了土壤有机碳（SOC）、全氮（TN）、土壤水溶性有机碳（WSOC）和微生物生物量C (MBC)， UR处理降低了土壤有机碳、TN和NO3−-N，但对WSOC和MBC没有影响。各处理间土壤温室气体排放与土壤温度和WSOC相关，而与土壤含水量和MBC无关。结论用豆科植物或非豆科植物替代具有竞争优势的林下植被增加了土壤温室气体排放和总升温潜能值，但增加了土壤C和N库，有利于增加土壤C储量，保持土壤肥力，提高板栗人工林的生产力。
Background and aimsThe impact of understory vegetation control or replacement with selected plant species, which are common forest plantation management practices, on soil C pool and greenhouse gas (GHG, including CO2, CH4and N2O) emissions are poorly understood. The objective of this paper was to investigate the effects of understory vegetation management on the dynamics of soil GHG emissions and labile C pools in an intensively managed Chinese chestnut (Castanea mollissimaBlume) plantation in subtropical China.MethodsA 12-month field experiment was conducted to study the dynamics of soil labile C pools and GHG emissions in a Chinese chestnut plantation under four different understory management practices: control (Control), understory removal (UR), replacement of understory vegetation withMedicago sativaL. (MS), and replacement withLolium perenneL. (LP). Soil GHG emissions were determined using the static chamber/GC technique.ResultsUnderstory management did not change the seasonal pattern of soil GHG emissions; however, as compared with the Control, the UR treatment increased soil CO2and N2O emissions and CH4uptake, and the MS and LP treatments increased CO2and N2O emissions and reduced CH4uptake (P< 0.05 for all treatment effects, same below). The total global warming potential (GWP) of GHG emissions in the Control, UR, MS, and LP treatments were 36.56, 39.40, 42.36, and 42.99 Mg CO2equivalent (CO2-e) ha−1year−1, respectively, with CO2emission accounting for more than 95 % of total GWP regardless of the understory management treatment. The MS and LP treatments increased soil organic C (SOC), total N (TN), soil water soluble organic C (WSOC) and microbial biomass C (MBC), while the UR treatment decreased SOC, TN and NO3−-N but had no effect on WSOC and MBC. Soil GHG emissions were correlated with soil temperature and WSOC across the treatments, but had no relationship with soil moisture content and MBC.ConclusionsAlthough replacing competitive understory vegetation with legume or less competitive non-legume species increased soil GHG emissions and total GWP, such treatments also increased soil C and N pools and are therefore beneficial for increasing soil C storage, maintaining soil fertility, and enhancing the productivity of Chinese chestnut plantations.