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当前位置: 首页 > 文章 > 植被类型和管理方式对4种经济林土壤活性碳氮及碳通量的影响 浙江林业科技 2019,39 (6) 12-18
Position: Home > Articles > Effect of Different Vegetation and Management on Soil Dissolved Organic Carbon and Inorganic Nitrogen and Carbon Flux under Four Vegetation Journal of Zhejiang Forestry Science and Technology 2019,39 (6) 12-18

植被类型和管理方式对4种经济林土壤活性碳氮及碳通量的影响

作  者：
彭艳;刘佳佳;王林均;杨成;潘贵英;孙鑫
单  位：
贵州民族大学 生态环境工程学院;贵州民族大学建筑工程学院;贵州民族大学
关键词：
植被类型;土壤溶解性有机碳;土壤无机氮;微生物量碳氮;碳通量
摘  要：
土壤活性碳氮含量与CO_2,CH_4通量对研究经济林土壤养分状况和碳氮循环有重要意义。以贵阳黄壤上4种经济林——松林(马尾松Pinus massoniana林)、茶('福鼎大白茶'Camellia sinensis 'Fuding-dabaicha')园、油桃(Prunus persica var. nectarina)林和女贞('金森女贞' Ligustrum japonicum 'Howardii'阔叶人工混交)林0～20 cm的表层土壤为研究对象,比较了植被类型和管理方式对土壤溶解性碳氮养分、微生物量碳氮和CO_2,CH_4通量的影响。结果表明:(1)4种经济林土壤溶解性有机碳含量在5.7～77.5 mg·kg~(-1),溶解性全氮含量在2.2～71.9mg·kg~(-1),各经济林间均没有显著性差异,但植被类型和树龄对其碳氮比有重要影响;(2)土壤NH_4~+-N含量在1.4～15.8 mg·kg~(-1),NO_3~--N含量在0.2～4.2 mg·kg~(-1),无机氮含量变化趋势与pH值相同,与树龄相反;(3)微生物量碳、微生物量氮分别介于221.1～601.4 mg·kg~(-1),41.1～110.2 mg·kg~(-1)之间,其比值受土壤碳氮比和含水量显著影响,且自然生长的经济林显著高于人工管理的经济林(P<0.05);(4)研究区表现为CO_2的源和CH_4的汇,其通量分别为~(-1)31.6～605.5 mg·m~(-2)·h~(-1),-583.1～0 mg·m~(-2)·h~(-1),植被类型对CO_2通量没有显著性影响,施硝态氮肥、长期连作等人工管理方式都会导致CH_4通量增加。试验结果表明,调节土壤水分条件和pH值,改进管理方式有助于减少经济林土壤温室气体的释放。
译  名：
Effect of Different Vegetation and Management on Soil Dissolved Organic Carbon and Inorganic Nitrogen and Carbon Flux under Four Vegetation
作  者：
PENG Yan;LIU Jia-jia;WANG Lin-jun;YANG Cheng;PAN Gui-ying;SUN Xin;College of Eco-Environment Engineering, GuizhouMinzu University;College of Architecture & Engineering,GuizhouMinzu University;Engineering Training Center, GuizhouMinzu University;
关键词：
vegetation type;;soil dissolved organic carbon;;inorganic nitrogen;;microbial biomass carbon and nitrogen;;carbon flux
摘  要：
In May 2018, soil samples of 0-20 cm was collected under Camellia sinensis garden, Pinus massoniana 'Fuding Dabaicha'stand,Prunussimoniist and Ligustrum japonica 'Howarii'stand in Guiyang, Guizhou province. Determinations were implemented on dissolved carbon(DC)and nitrogen(DN) content, microbial biomass carbon(SMBC) and nitrogen(SMBN), CO_2 and CH_4 flux. The results showed that soil dissolved organic carbon(DOC) and nitrogen(DON) content in the sampled vegetation ranged 5.7-77.5 mg/kg, 2.2-71.9 mg/kg respectively. There was no significant difference of DOC and DON content among different vegetation, but C/N was significantly affected by vegetation type and tree age. Soil content of NH_4~+-N ranged from 1.4 to 15.8 mg/kg and content of NO_3~--N ranged from 0.2 and 4.2 mg/kg.The inorganic nitrogen content had same trend with soil pH, but opposite with tree age. SMBC and SMBN ranged from 221.1 to 601.4 mg/kg,41.1 to 110.2 mg/kg respectively. SMBC/SMBN was significantly affected by soilC/N and water content. And that in P.massoniana and L. japonica 'Howarii' forest was significantly higher than that in the left two stands.CO_2 sources and CH_4 sinks in the investigated stands were respectively varied from-131.6 to 605.5 mg/m~2/h, 21.6 to195.1 mg/m~2/h. Vegetation types had no significant effect on CO_2 flux, but fertilization of nitrogen and long-term continuous cropping could increase CH_4 flux.

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