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首页> 外文期刊>Plant and Soil >Understory vegetation management affected greenhouse gas emissions and labile organic carbon pools in an intensively managed Chinese chestnut plantation
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Understory vegetation management affected greenhouse gas emissions and labile organic carbon pools in an intensively managed Chinese chestnut plantation

机译：在集约化管理的板栗人工林中，林下植被管理影响了温室气体排放和不稳定的有机碳库

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The 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, CH4 and 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 mollissima Blume) plantation in subtropical China. A 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 with Medicago sativa L. (MS), and replacement with Lolium perenne L. (LP). Soil GHG emissions were determined using the static chamber/GC technique. Understory management did not change the seasonal pattern of soil GHG emissions; however, as compared with the Control, the UR treatment increased soil CO2 and N2O emissions and CH4 uptake, and the MS and LP treatments increased CO2 and N2O emissions and reduced CH4 uptake (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 CO2 equivalent (CO2-e) ha(-1) year(-1), respectively, with CO2 emission 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. Although 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.
机译：人们很少了解林下植被控制或以常见的人工林管理实践选择的植物种类替代对土壤碳库和温室气体（GHG，包括CO2，CH4和N2O）排放的影响。本文的目的是调查亚热带集约化管理板栗（Castanea mollissima Blume）人工林中林下植被管理对土壤温室气体排放和不稳定碳库动态的影响。进行了一个为期12个月的田间试验，研究了四种不同的林下管理措施：控制（对照），林下清除（UR），用紫花苜蓿替代林下植被的中国板栗种植园中土壤不稳定碳库和温室气体排放的动态。 L.（MS），并用黑麦草（LP）代替。使用静态室/ GC技术确定土壤温室气体排放量。林下管理并没有改变土壤温室气体排放的季节性模式。但是，与对照相比，UR处理增加了土壤CO2和N2O排放量以及CH4的吸收，而MS和LP处理增加了CO2和N2O排放量并减少了CH4的吸收（所有处理效果的P <0.05，下同）。在对照，UR，MS和LP处理中，GHG排放的总全球变暖潜能（GWP）为36.56、39.40、42.36和42.99 Mg CO2当量（CO2-e）ha（-1）年（-1），不论底层管理如何，CO2排放量均占总GWP的95％以上。 MS和LP处理提高了土壤有机碳（SOC），总氮（TN），土壤水溶性有机碳（WSOC）和微生物生物量C（MBC），而UR处理降低了SOC，TN和NO3（-）-N但对WSOC和MBC没有影响。在处理过程中，土壤温室气体排放与土壤温度和WSOC相关，但与土壤水分和MBC无关。尽管用豆科植物或竞争性较弱的非豆科植物替代竞争性林下植被增加了土壤温室气体排放量和总GWP，但这种处理方法也增加了土壤碳和氮库，因此有利于增加土壤碳的储存，维持土壤肥力并提高土壤生产力。板栗种植园。

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