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哀牢山亚热带常绿阔叶林土壤含水量变化规律及其影响因子

余雷1,3,张一平1,2**,沙丽清1,2,宋清海1,3,谭正洪1,周文君1,3,武传胜1,2,3   

  1. 1中国科学院热带森林生态学重点实验室(西双版纳热带植物园), 昆明 650223; 2中国科学院哀牢山亚热带森林生态系统研究站, 云南景东 676209; 3中国科学院大学, 北京 100049)
  • 出版日期:2013-02-10 发布日期:2013-02-10

Temporal variation pattern and its affecting factors of soil water content in a subtropical evergreen broadleaved forest in Ailao Mountains, Southwest China.

YU Lei1,3, ZHANG Yi-ping1,2**, SHA Li-qing1,2, SONG Qing-hai1,3, TAN Zheng-hong1, ZHOU Wen-jun1,3, WU Chuan-sheng1,2,3   

  1. (1Key Laboratory of Tropical Forest Ecology (Xishuangbanna Tropical Botanical Garden), Chinese Academy of Sciences, Kunming 650223, Yunnan, China; 2Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Academy of Sciences, Jingdong 676209, Yunnan, China; 3University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2013-02-10 Published:2013-02-10

摘要: 利用ChinaFlux设置在哀牢山亚热带常绿阔叶林内的通量观测系统的土壤含水量数据,分析了哀牢山亚热带常绿阔叶林内土壤含水量的时间变化及其影响因子,以期了解哀牢山亚热带常绿阔叶林土壤含水量特征及其变化规律,为森林固碳能力、潜力和速率研究提供支撑。结果表明:(1)哀牢山亚热带常绿阔叶林不同深度土壤含水量大致呈单峰曲线分布,各层土壤含水量基本上随着土壤深度的增加而降低,波动范围也逐渐减小,最小值均在3月,最大值集中在7、8、9三个月。(2)0~100 cm各层深度的土壤含水量在17.7%~39.5%波动,其中100 cm深度的土壤含水量值最低、波动范围最小,总体来看,土壤含水量雨季高于旱季。(3)土壤含水量主要受降雨量、地温和相对湿度等要素的影响(P<0.05),哀牢山亚热带常绿阔叶林5 cm深度的土壤含水量最大,约为38%。

关键词: 土壤含水量, 温室, 黄瓜

Abstract: Based on the soil water content data from the Flux Observation System of ChinaFlux installed in a subtropical evergreen broadleaved forest in the Ailao Mountains, Yunnan Province of Southwest China, the temporal variation and its affecting factors of soil water content in the forest were analyzed, aimed to further understand the characteristics and the annual variation pattern of the soil water content, and to provide basis to study the carbon sequestration ability, potential, and rate of local forest. In this forest, the soil water content at different depths more or less presented a single peak curve. With decreasing depth, the soil water content decreased, and its fluctuation range also had a gradual decrease, with the minima occurred in March and the maxima in July, August, and September. In the 0-100 cm profile, the soil water content in different layers ranged from 17.7% to 39.5%, with the minima and the least fluctuation at the depth 100 cm. Overall, the soil water content was higher in rainy season than in dry season. The soil water content was mainly affected by precipitation, soil temperature, and relative humidity (P<0.05). The maximum soil water content at the depth 5 cm in the subtropical evergreen broadleaved forest in Ailao Mountains was about 38%.