摘要
为了解热带滨海砂地生态系统碳通量特征及其成因,本研究以海南省文昌地区典型砂地植被为例,采用涡度相关技术进行长期的碳通量观测,同期开展了温度、降雨、辐射等气象因子监测.结果表明:1)典型热带滨海砂地植被碳汇/效益显著,2016年碳收支量为-400.959 g·m^(-2)·y^(-1);2)典型热带滨海砂地植被生态系统碳交换的季节变化明显,雨季(5~10月)碳通量变化差异较大,雨季前期(5~7月)净CO2交换(NEE,Net Ecosystem Exchange)占全年碳交换量的58%,而雨季后期(8~10月)受降雨等因素影响,NEE仅占全年碳交换量的10.7%;3)典型热带滨海砂地植被生态系统碳交换有明显的日变化格局,净生态系统碳交换最大值出现在正午12:00~2:00之间.日最大交换量出现在4月,最大值为-0.655 mg·m^(-2)·s^(-1);4)雨季生态系统碳交换量对于气象因子的响应显著于旱季,光合有效辐射是影响生态系统碳通量的主要影响因子,其雨季相关性R^2为0.70.
In order to understand the dynamic structure and characters of carbon flux of tropical coastal sandy vegetation ecosystem,a typical coastal sandy forest of Wenchang,China,was used as an example,and turbo related technology was used to perform a long-term ecological observation,and the climate factor,including temperature,rainfall and radiation were monitored. The results indicated that：（1） The carbon sequestration of typical tropical coastal sandy ecosystem is significant,and the total net carbon budget of 2016 is-400. 959 g·m^-2·y^-1;（2） The seasonal variation of typical tropical coastal sandy vegetation ecosystem carbon exchange significantly,and the difference of carbon flux is larger in rainy season. Because of the effect by the rain and other factors,the NEE of early rainy season account for 58% of the total carbon exchange in the whole rainy season. The NEE only account for 10. 7% of the amount of carbon exchange.（3） The carbon exchange of the typical tropical coastal sandy vegetation ecosystem has obvious diurnal variations,the peak of the single day appear at 12： 30-（-1）4： 00. The maximum daily exchange value appear in April,the maximum value is-0. 655 mg·m^-2·s^-1;（4） The response to meteorological factors of ecological system carbon exchange in rainy season is more significant than that in dry season. Photosynthetically active radiation is the main influence factor of ecosystem carbon flux,the correlation coefficient in the rainy season（R-2） was 0. 70.
作者
李东丽
傅国华
薛杨
杨众养
Li Dongli1 , Fu Guohua2＇3 , Xue Yang4, Yang Zhongyang4(1. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China; 2. Institute of Economics and Management, Hainan University , Haikou 570228, China; 3. Hainan Policy and Industrial Research Institute of Low-Carbon Economy, Haikou 570228, China 4. Hainan Forestry Institute, Haikou 571100, China)
出处
《海南大学学报（自然科学版）》
CAS
2018年第2期173-182,共10页
Natural Science Journal of Hainan University
基金
海南省低碳旅游城市建设评价指标体系研究项目(20167259)
