不同营林措施对马尾松林土壤呼吸影响  

Effect of Forest Management on Soil Respiration of Pinus massoniana

作　　者：雷蕾[1,2] 肖文发[1,2] 曾立雄[1,2] 黄志霖[1,2] 高尚坤[1,2] 谭本旺 

机构地区：[1]中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室,北京100091 [2]湖北秭归三峡库区森林生态系统国家定位观测研究站,湖北宜昌443631 [3]湖北省秭归县林业局,湖北宜昌443631

出　　处：《林业科学研究》2015年第5期713-719,共7页Forest Research

基　　金：林业公益性行业科研专项"典型森林土壤碳储量分布格局及变化规律研究"(项目编号:201104008);中央级公益性科研院所基本科研业务费专项资金"典型森林土壤有机碳空间分布格局及其制图"(项目编号:CAFRIFEEP201101)

摘　　要：以三峡库区马尾松飞播林为研究对象,针对不同营林措施:除灌(清除所有除灌产生的枝叶)、采伐I(采伐强度15%,采伐树干,并未对枝叶进行清除)、采伐II(采伐强度70%,采伐剩余物处理同采伐I)、对照,采用LI-8100土壤CO2通量测定系统对其土壤呼吸速率进行为期1年的连续观测,分析了不同营林措施对于土壤呼吸的影响以及不同营林措施下土壤呼吸产生差异的原因。结果显示:年土壤呼吸速率均值除灌(1.82±0.07μmol·m-2·s-1)<对照(2.18±0.05μmol·m-2·s-1)<采伐I(2.37±0.07μmol·m-2·s-1)<采伐II(2.86±0.1μmol·m-2·s-1);采伐强度与土壤呼吸速率增值呈正比;不同营林措施与对照土壤呼吸速率均在夏季生长旺盛期7—8月达到最大值;高强度的采伐显著提高了土壤温度与湿度,对照、除灌、采伐I、采伐II土壤呼吸敏感性指数Q10值依次为:2.18±1.09、1.65±0.07、2.20±0.09,2.36±0.09。Aerially seeded Pinus massoniana forest in the Three Gorges Reservoir area with different management treatments, including shrubs-cutting plus residue removal, harvest Ⅰ （cutting intensity 15%, stem-only harvesting without residue removal） , harvest II （cutting intensity 70% , harvest type as harvest Ⅰ） and the control, were sur- veyed to measure the total soil respiration rates over a year by using LI-8100 system. The influence of various forest managements on soil respiration was discussed and the reasons causing the variability of soil respiration were ana- lyzed. The results showed that： the annual soil respiration of forests with different treatments wasl. 82 ±0.07 μmol·m^-2·s^-1 （ shrubs-cutting）, 2.18 ±0.05 μmol·m^-2·s^-1 （ control）, 2.37 ±0.07 μmol·m^-2·s^-1 （ harvest I）, and 2.86±0.1 μmol·m^-2·s^-1 （harvest Ⅱ）. The harvest intensity was positively related to soil respiration increment; soil respiration of all the harvest treatment reached the maximum in July and August. High intensity improved the soil temperature and moisture. The temperature sensitivity indexes of the control, shrubs-cutting, harvest I, and harvest Ⅱ were 2.18 ±1.09, 1.65 ±0.07, 2.20 ±0.09 and 2.36±0.09 respectively.

关 键 词：马尾松 土壤呼吸速率 除灌 采伐 土壤温度 土壤湿度 

分 类 号：S791.248[农业科学—林木遗传育种]