干旱区生态环境知识资源中心(Arid): 荒漠植物沙拐枣群体光合作用及土壤呼吸研究

Arid

	荒漠植物沙拐枣群体光合作用及土壤呼吸研究
其他题名	Canopy photosynthesis and soil respiration of desert plant Calligonum potanini
	苏培玺; 周紫鹃; 张海娜; 李善家; 解婷婷
来源期刊	北京林业大学学报
ISSN	1000-1522
出版年	2013
卷号	35 期号:3 页码:56-64
中文摘要	为了探讨荒漠植物群体光合作用和干旱荒漠区碳源汇特征,联合利用改进同化箱和LI-8100土壤CO2通量自动测量系统,选择高温强光和适宜环境期,连续2年进行了观测研究。结果表明:沙拐枣群体光合速率(CAP)在不同年份、不同月份差异较大,土壤水分改善可显著提高群体光合能力,高温强光期和适宜环境期日平均(08:00-18:00)CAP分别为1.82和2.89mumol/(m~2·s);用同化枝水平光合速率(P_n)计算群体水平光合速率时,高温强光期和适宜环境期分别用公式CAP=0.12P_n+0.39(r=0.86,P<0.0001)和CAP=0.18P_n+0.28(r=0.92,P<0.0001)。沙拐枣生长期植冠下土壤CO_2释放速率平均为0.29mumol/(m~2·s),荒漠裸地为0.15mumol/(m~2·s)。沙拐枣群体生长期固定碳为3.82g/(m2·a);相应时期植冠下土壤释放碳为1.03g/(m2·a),荒漠裸地为0.53g/(m2·a)。研究表明:在水分短缺的荒漠地区,荒漠植物沙拐枣群体光合速率提高幅度超过根系主要分布层土壤水分提高幅度,适宜环境期可提高近1倍。荒漠生态系统土壤呼吸速率较低,荒漠裸地土壤呼吸速率约为植冠下的50%。荒漠植物沙拐枣种群区为弱碳源。
英文摘要	In order to explore canopy photosynthesis of desert plant Calligonum potanini,and characteristics of carbon source and carbon sink in arid desert area,the canopy apparent photosynthesis and soil CO_2 efflux rate were measured in high temperature and irradiation and suitable environment periods by the modified assimilation chamber and LI-8100 automated soil CO_2 flux system in two years. The results showed that the difference of canopy apparent photosynthetic rate (CAP) of C. potanini in different years and months was significant,the canopy photosynthesis was enhanced significantly with improving soil water,the average CAP (08: 00--18: 00) was 1. 82 mumol /(m~2·s) in high temperature and irradiation period and 2. 89 mumol /(m~2·s) in suitable environment period,respectively. The calculated formula of CAP by photosynthetic rate of assimilating shoots (P_n) was CAP = 0. 12P_n + 0. 39 (r = 0. 86,P < 0. 000 1) in high temperature and irradiation period and CAP = 0. 18P_n + 0. 28 (r = 0. 92,P < 0. 000 1) in suitable environment period. The soil CO_2 efflux rate under plant canopy was 0. 29 mumol /(m~2·s) in growth period,and it was 0. 15 mumol /(m~2·s) in desert bare land. The fixed carbon of C. potanini canopy in growth period was 3. 82 g /(m~2·a),the released carbon under plant canopy was 1. 03 and 0. 53 g /(m~2· a) in desert bare land in the same period. These results indicated that the increasing in canopy apparent photosynthetic rate of desert plant C. potanini exceeded the increasing range of soil water in the layers of root mainly distributed in the water shortage desert area; it doubled in suitable environment period. The soil respiration rate of desert ecosystem was lower and that in desert bare land was about 50% of that under plant canopy. The zone of desert plant C. potanini population was a weak carbon source.
中文关键词	荒漠 ; 群体光合速率 ; 土壤CO_2释放速率 ; 碳平衡
英文关键词	desert canopy apparent photosynthetic rate soil CO_2 efflux rate carbon balance
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:4846015
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229212
作者单位	中国科学院寒区旱区环境与工程研究所临泽内陆河流域研究站, 中国科学院寒旱区陆面过程与气候变化重点实验室, 730000
推荐引用方式 GB/T 7714	苏培玺,周紫鹃,张海娜,等. 荒漠植物沙拐枣群体光合作用及土壤呼吸研究[J]. 中国科学院西北生态环境资源研究院,2013,35(3):56-64.
APA	苏培玺,周紫鹃,张海娜,李善家,&解婷婷.(2013).荒漠植物沙拐枣群体光合作用及土壤呼吸研究.北京林业大学学报,35(3),56-64.
MLA	苏培玺,et al."荒漠植物沙拐枣群体光合作用及土壤呼吸研究".北京林业大学学报 35.3(2013):56-64.