干旱区生态环境知识资源中心(Arid): 黄土高原羊圈沟小流域不同坡向、林龄刺槐人工林叶片尺度水碳交换及叶片养分差异

Arid

	黄土高原羊圈沟小流域不同坡向、林龄刺槐人工林叶片尺度水碳交换及叶片养分差异
其他题名	Variations of water-carbon exchange at leaf scale and leaf nutrient content of Robinia pseudoacacia with slope aspect and stand age in a small catchment of the Loess Plateau
	张迪 1; 靳甜甜 2
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2016
卷号	35 期号:2 页码:354-362
中文摘要	以黄土高原典型小流域(羊圈沟小流域)内刺槐人工林为对象,通过测定叶片尺度水碳交换过程及主要影响因素,探究了叶片尺度水碳交换随坡向和林龄的变化,并分析了叶片养分变化对水碳交换过程的潜在影响。结果表明:(1)11年生与27年生刺槐处于不同的生长阶段,前者水碳交换的强度高于后者。(2) 半阳坡中光合固碳、水分利用效率及CO_2供应能力强的刺槐所占比例高于阳坡,说明半阳坡更适合刺槐生长。(3) 叶片N、K含量在样方间的变化趋势为:半阳坡>阳坡,27年生>11年生,说明半阳坡刺槐的生长状况好于阳坡,高林龄刺槐的生长状况好于低林龄刺槐。同时,各样方间K含量具有显著差异,说明K对坡向及林龄的变化较为敏感。因此,与阳坡相比,该区域未来人工刺槐林建设应优先选择水热条件更为适宜的半阳坡,且在富含有效钾的土壤中进行植被恢复是提高植物水分利用效率的潜在途径,该研究结果对于未来干旱半干旱区退耕还林方案的改进及已有人工林的管理具有借鉴意义。
英文摘要	Water-carbon exchange process and major influencing factors of Robinia pseudoacacia plantations in the Yangjuangou watershed of the Chinese Loess Plateau were measured at leaf scale, to explore the variations of water-carbon exchange with slope aspects and stand ages and analyze the potential effects of nutrient contents in leaves on water-carbon exchange process. The results showed that: (1) 11- and 27-year-old R. pseudoacacia were at different growing stages. The former had a higher intensity of water-carbon exchange than the latter. (2) The proportion of R. pseudoacacia individuals with higher net photosynthetic rate, water use efficiency, stomatal conductance and intercellular CO2 concentration was greater on semi-sunny slope than on sunny slope, suggesting that semi-sunny slope was more suitable for R. pseudoacacia growth. (3) The variation patterns of N and K contents in different quadrats were as follows: semi-sunny slope>sunny slope, 27-year-old>11-year-old, indicating that R. pseudoacacia grew better on the semisunny slope than on the sunny slope, mature R. pseudoacacia grew better than juvenile R. pseudoacacia. The differences of K content in leaf in different quadrats were significant, suggesting that K content in leaf was sensitive to the changes of slope aspect and stand age. Therefore, compared with the sunny slope, the semi-sunny slope with more suitable hydrothermal condition should be considered as priority for establishing R. pseudoacacia plantation, and the reforestation on soils with enriched available K could be a potential way for improving plants water use efficiency. These results are significantly instructive for the improvement of Grain for Green Project and the management of existing plantations in the arid and semi-arid regions.
中文关键词	刺槐 ; 水碳交换 ; 林龄 ; 坡向
英文关键词	Robinia pseudoacacia water-carbon exchange stand age aspect
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:5640319
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234852
作者单位	1.兰州大学资源环境学院, 兰州, 甘肃 730000, 中国; 2.中国水利水电科学研究院水电中心, 北京 100038, 中国
推荐引用方式 GB/T 7714	张迪,靳甜甜. 黄土高原羊圈沟小流域不同坡向、林龄刺槐人工林叶片尺度水碳交换及叶片养分差异[J]. 兰州大学,2016,35(2):354-362.
APA	张迪,&靳甜甜.(2016).黄土高原羊圈沟小流域不同坡向、林龄刺槐人工林叶片尺度水碳交换及叶片养分差异.生态学杂志,35(2),354-362.
MLA	张迪,et al."黄土高原羊圈沟小流域不同坡向、林龄刺槐人工林叶片尺度水碳交换及叶片养分差异".生态学杂志 35.2(2016):354-362.