不同林龄橡胶林土壤呼吸速率的变化及其与水热因子的关系  

Comparison of soil respiration rate in rubber plantations at different stand ages and Its relationship with soil hydrothermal factors

作　　者：原慧芳[1] 谢江[1] 张勇波 陈国云[1] 田耀华[1] YUAN Huifang;XIE Jiang;ZHANG Yongbo;CHEN Guoyun;TIAN Yaohua(Yunnan Institute of Tropical Crops,Jinghong,Yunnan 666100,China)

机构地区：[1]云南省热带作物科学研究所,云南景洪666100

出　　处：《热带生物学报》2022年第1期13-18,共6页Journal of Tropical Biology

基　　金：云南省热带作物科技创新专项资金(RF2021-3)。

摘　　要：为探明不同林龄橡胶林土壤呼吸速率(Rs)的变化特征及其与水热因子的关系,以云南省景洪市3个不同林龄(2年幼林、7年成林、30年老林)的橡胶林为对象,连续2年,每月定期原位测定地表5 cm土壤呼吸速率(Rs)、土壤温度(Ts)和土壤湿度(Ms)的变化特征。结果表明:3个不同林龄橡胶林的Rs均有显著差异(P<0.05),2年幼林(YR)显著高于7年成林(MR),30年老林(OR)显著最低;3个不同林龄橡胶林的Rs、Ts和Ms均表现为雨季显著高于干季的季节性变化规律;各林龄土壤呼吸速率峰值出现的月份不一致,YR、MR和OR的Rs最高值分别为9月、7月和6月;3个不同林龄橡胶林的Rs与Ts、Ms具有极显著(P<0.01)的正相关关系,其中Ms相关性最大,Ts相关性较弱。回归分析结果表明,不同林龄橡胶林土壤呼吸速率的变化特征是水热因子联合效应的结果,土壤呼吸速率受土壤湿度影响最大,受土壤温度的影响作用相对较小。In order to explore the changes of soil respiration rate(Rs)and the relationship between Rs and hydrothermal factors in rubber plantations of different ages,rubber plantations at three different stand ages(2 a,7 a,30 a)were selected for analysis.The change characteristics of soil respiration rate(Rs),soil temperature(Ts)and soil moisture(Ms)in 5 cm soil surface were measured in situ every month for two years.The results showed that the Rs of rubber plantations at the three stand ages were significantly different(P<0.05).The Rs of the 2 a rubber plantation(young rubber plantation,YR)was significantly higher than that of the 7 a rubber plantation(mature rubber plantations,MR),and the Rs of the 30 a rubber plantation(old rubber plantation,OR)was the lowest.The Rs,Ts and Ms of the rubber plantations at the three stand ages had obvious seasonal variation,showing significantly higher values in rainy season than in dry season.The peak of soil respiration rate of the rubber plantations at different ages appeared in different months,and the highest Rs values of YR,MR and OR occurred in September,July and June respectively.The Rs had a highly significant positive correlation(P<0.01)with Ts and Ms in the rubber plantations at different stand ages,the highest with Ms and the lower with Ts.Regression analysis showed that the change characteristics of the Rs in the rubber plantations of different stand ages are the results of combined effect of multiple hydrothermal factors and that Rs is affected mostly by Ms and relatively less by Ts.

关 键 词：橡胶林 土壤呼吸速率 土壤温度 土壤湿度 水热因子 

分 类 号：S794.1[农业科学—林木遗传育种] S154.1[农业科学—林学]