不同间伐强度对杉木人工林土壤呼吸速率的短期影响  

Short-term effects of different thinning intensities on soil respiration rate in the Cunninghamia lanceolata plantation

作　　者：陈炎根 胡艳静 黄莎 刘波 吴继来 王懿祥[2,3] CHEN Yangen;HU Yanjing;HUANG Sha;LIU Bo;WU Jilai;WANG Yixiang(Forestry Bureau of Lin’an District,Hangzhou 311300,Zhejiang,China;College of Environment and Resources,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;State Key Laboratory of Subtropical Silviculture,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China)

机构地区：[1]浙江省杭州市临安区林业局,浙江杭州311300 [2]浙江农林大学环境与资源学院,浙江杭州311300 [3]浙江农林大学省部共建亚热带森林培育国家重点实验室,浙江杭州311300

出　　处：《浙江农林大学学报》2023年第5期1054-1062,共9页Journal of Zhejiang A&F University

基　　金：国家重点研发计划项目(2021YFD2201304)。

摘　　要：【目的】比较不同间伐强度下杉木Cunninghamia lanceolata人工林土壤呼吸速率,解释影响土壤呼吸速率的主要因子,为森林经营及碳汇管理提供科学依据。【方法】采用随机区组设计,设置对照(间伐0%)、中度间伐(间伐45%)、重度间伐(间伐70%)3种间伐处理,采用静态箱-气象色谱法对杉木人工林土壤呼吸速率进行短期原位监测。【结果】间伐显著增加了杉木林土壤呼吸速率(P<0.05),与对照相比,中度和重度间伐的土壤呼吸速率分别增加了23.30%和44.94%。土壤呼吸速率与5 cm土壤温度呈显著指数相关,而与土壤含水量无关。不同间伐处理下,土壤呼吸温度敏感性系数(Q_(10))为1.77~2.16,对照处理下Q_(10)最高,间伐降低了杉木林土壤呼吸的温度敏感性。杉木人工林土壤呼吸速率与土壤水溶性有机碳、微生物生物量碳和易氧化有机碳呈显著正相关(P<0.01)。【结论】间伐初期,间伐对杉木林土壤呼吸速率有促进作用,且随着间伐强度的增加而增加。土壤温度是土壤呼吸速率变化的主要影响因子,土壤活性有机碳是重要因子。[Objective]This study,with a comparison of the differences in soil respiration rates of Cunninghamia lanceolata plantations under different thinning intensities,is aimed to investigate the main factors affecting soil respiration rates,so as to provide a scientific basis for forest management and carbon sink management.[Method]With a randomized block design,three thinning treatments,namely control(thinning 0%),moderate thinning(thinning 45%)and heavy thinning(thinning 70%)were arranged before short-term in-situ monitoring was conducted of soil respiration rates in C.lanceolata plantations using static box-meteorological chromatography.[Result]Thinning significantly increased the soil respiration rate in C.lanceolata forest,with an increase of 23.30%and 44.94%for the ones treated with moderate and heavy thinning respectively.Soil respiration rate was exponentially correlated with soil temperature at 5 cm depth,but not with soil water content.The temperature sensitivity coefficient(Q_(10))of soil respiration ranged from 1.77 to 2.16 under different thinning treatments, with the Q_(10) being the highest under the control treatment, and thinning decreased the temperature sensitivity of soil respiration in C. lanceolata stands. Soil respiration rate of C. lanceolata plantation was positively correlated with soil water-soluble organic carbon, microbial biomass carbon and permanganate-oxidizable carbon (P<0.01). [Conclusion] Thinning promoted the soil respiration rate of C. lanceolata forest which increased with the increase of thinning intensity. Soil temperature is the main factor affecting the change in soil respiration rate, with soil active organic carbon being an important factor.

关 键 词：杉木人工林 间伐强度 土壤活性有机碳 土壤温湿度 土壤呼吸 

分 类 号：S714.5[农业科学—林学]