摘要
为探讨神农架华山松(Pinus amandii)人工林土壤呼吸季节变化规律,以及林地内枯立木数量、分解程度及其形成的林窗等对土壤呼吸速率的影响,选取受病虫侵害后的华山松人工林为研究对象,在各月晴好天气利用Li-8100便携式土壤呼吸测量系统对土壤呼吸速率、土壤温度、土壤含水量进行持续8个月(2019年4—11月)的定点观测,分析华山松人工林土壤呼吸速率特征及其与枯立木分布格局的关系,结果表明:(1)观测期内土壤呼吸速率在7月出现最大值(3.80μmol·m−2·s−1),在11月出现最小值(1.15μmol·m−2·s−1),且呈现明显的季节动态;土壤呼吸速率与土壤温度呈极显著相关(P<0.01),与土壤含水量相关性不显著;由土壤温度和含水量建立的二元线性回归模型能更好预测华山松林土壤呼吸速率。(2)土壤呼吸速率与枯立木数量呈负相关,且土壤呼吸与距离呼吸环3 m半径范围内的枯立木数量呈显著性相关(P<0.05);不同分解程度枯立木数量对土壤呼吸速率的影响大小依次为高度分解数量(XH)>中度分解数量(XM)>轻度分解数量(XL),高度分解的枯立木数量对土壤呼吸速率影响较大。(3)观测期林窗内和林下土壤呼吸速率平均值分别为3.43μmol·m−2·s−1和2.19μmol·m−2·s−1;林窗内外土壤呼吸速率呈现极显著差异(P<0.01),各月份林窗内土壤呼吸速率均显著高于林下;林窗内和林下的土壤呼吸温度敏感系数Q10值分别为2.94和2.46。
In order to explore the seasonal variation of soil respiration of Pinus armandii plantation in Shennongjia,and effects of the quantity of snags,degree of decomposition and forest gap on soil respiration rate,we selected the P.armandii plantation disturbed by pests as the research object in Shennongjia and measured the soil respiration,soil temperature and moisture of P.armandii plantation by Li-8100(portable soil respiration measurement system)during the fine days per month for eight months from April 2019 to November 2019.On this basis,the characteristics of soil respiration rate and its relationship with the distribution pattern of snags were analyzed.The results showed that:(1)During the observation period,the maximum value(3.80μmol·m−2·s−1)of the soil respiration rate appeared in July and the minimum value(1.15μmol·m−2·s−1)appeared in November,showing obvious seasonal dynamics;soil respiration rate was significantly related to soil temperature(P<0.01),but not to soil moisture;the binary linear regression model was established based on soil temperature and water content can better predict the soil respiration rate of P.armandii plantation.(2)There was a negative correlation between soil respiration rate and quantity of snags.There was a significant correlation between the soil respiration rate and quantity of snags within a radius of 3 m from the respiratory ring(P<0.05).The effect of quantity of snags with different decomposed degrees on the soil respiration rate is in order of high decomposed quantity(XH)>medium decomposed quantity(XM)>light decomposed quantity(XL),and the quantity of high decomposed snags has a greater impact on the soil respiration rate.And(3)during the observation period,the average values of soil respiration rate in forest gap and under forest were 3.43μmol·m−2·s−1 and 2.19μmol·m−2·s−1,respectively.Soil respiration rate inside and outside the forest gap showed extremely significant differences.Soil respiration rate of forest gap was significantly higher than that of under forest every month;Temperature sensitivity of soil respiration(Q10)of forest gap and under forest was 2.94 and 2.46,respectively.
作者
黄金莲
崔鸿侠
唐万鹏
雷静品
周文昌
胡琛
马国飞
HUANG Jinlian;CUI Hongxia;TANG Wanpeng;LEI Jingpin;ZHOU Wenchang;HU Chen;MA Guofei(Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China;Hubei Academy of Forestry,Wuhan 430075,China;Administrative Bureau of Shennongjia National Park,Shennongjia 442421,China)
出处
《生态环境学报》
CSCD
北大核心
2020年第9期1776-1783,共8页
Ecology and Environmental Sciences
基金
湖北省技术创新重大专项(2019AC161)
科技协同创新与攻关课题(2019SNJ001)
国家林业局生态站监测运行补助项目(2019132066)。
关键词
华山松人工林
土壤呼吸
枯立木
分解程度
林窗
Pinus amandii plantation
soil respiration
snags
degree of decomposition
forest gap
