【作者】 张一平； 梁乃申； 姚玉刚； 谭正洪； 沙丽清； 高举明； 宋清海； 张明达； 李志恒； 杨振；

【Author】 ZHANG Yiping1, LIANG Naishen2, YAO Yugang1,3, TAN Zhenghong1,3, SHA Liqing1,GAO Juming1,3, SONG Qinghai1,3, ZHANG Mingda1,3,LI Zhiheng1,3,YANG Zhen1,3 1 Xishuangbanna Tropic Botanic Garden, CAS. Kunming 650223 2 National Institute of Environmental Studies, Japan 305-8506 3 Graduate University of Chinese Academy of Sciences,Beijing 100039

【机构】 中国科学院西双版纳热带植物园； 日本国立环境研究所；

【摘要】 目标:利用不同高度的CO2浓度廓线整年连续观测资料,验证西双版纳热带山地区域,处于山谷中的热带季节雨林是否会出现碳湖现象?所形成的碳湖具有什么分布特征和变化规律?其碳湖效应如何?对热带森林生态系统NEE的计算有没有影响?方法:利用建于起伏山坡阶梯上小凹地之处的铁塔上设置的8通道CO2浓度廓线观测仪1年的连续实测资料,通过统计分析,探讨碳湖现象是否存在;并用聚类分析方法,根据近地层(0.5m)的CO2浓度的日变化特征,对碳湖现象进行分类,得出碳湖的不同类型及其分布特征,分析不同类型碳湖的效应,及其对热带雨林NEE的影响。主要发现:在西双版纳山地中,存在碳湖现象;依据近地层CO2浓度的日变化特征来分类,可以分为8个类型;出现碳湖现象的a组可分为5个类型,其频率为51.8%;各种类型的碳湖具有较为复杂的日变化特征,可以为多峰型和单峰型;在碳湖现象出现时,傍晚多有CO2浓度的峰值出现;碳湖的强度,夜间大于昼间;雨季大于干季。碳湖现象每个月均可出现,3~10月出现频率较高,最多频次出现在6月,最少频次出现在2月;而未出现碳湖现象的b组可分为3个类型,主要分布在10~3月,最多频次出现在2月,在4~6月频率较低。各种类型的碳湖所导致的CO2浓度的变化主要出现在林内,对于林冠层及其林冠上方的CO2浓度的影响较小;不同碳湖类型的CO2浓度的垂直变率和时间变率呈现各异的分布特征和变化规律,将影响热带雨林的碳通量和森林大气碳储量变化,进而影响热带雨林的NEE,导致热带雨林的NEE呈现复杂的分布特征和变化规律,由此可以认为:碳湖现象导致的碳湖效应对处于山地的热带雨林的NEE具有明显影响,对热带雨林的碳汇源效应起着不可忽视的作用。更多还原

【Abstract】 Gaining a good knowledge of carbon motion in inside and outside forests is a necessary first step towards a better understanding of carbon cycle mechanism. This paper extended the knowledge by employing advances in our understanding of the carbon lake phenomena in complex terrain. Make use of continuous year-round observation data of CO2 concentration profile with different heights from tower situated in tropical seasonal rainforest of Xishuangbanna, we want to validate the carbon lake phenomena exist or not in a valley. Measurements were performed on the ladder of the pit in the slopes of tropical seasonal rainforest of Xishuangbanna, over 1 year. Carbon lake phenomena really exist in mountainous areas, which discussed through statistical analysis. Use cluster analysis based on diurnal CO2 concentration change character at surface layer (0.5m), we divide the phenomena into two parts. One is A group (contains 5 types), stand for carbon lake phenomena emergence, which frequency is 51.8%, the other is B group (contains 3 types), without any carbon lake appearance. When carbon lake come forth, always accompany with the peak of CO2 concentration. Likewise, the intensity of carbon lake in the daytime was more than nighttime, and it in rainy season was more than dry season. Carbon lake reached higher frequency from March through October, and the highest record was appeared on June, while the lowest one was on February. However, B group mainly distribution from October through March, and the highest record was appeared on February, while lower from April through June. Variation of CO2 concentration induces by different types of carbon lake mainly present for below canopy, nor in canopy and above. Under different carbon lake types, the variable ratios of vertical and time were shown the divergent distribution character and change laws, which can obviously influence on carbon flux and carbon sequestration of tropical forest. This synthesis study has identified a number of important questions in need of further research.更多还原