Canopy transpiration of Pinus sylvestris var. mongolica in a sparse wood grassland in the semiarid sandy region of Northeast China
Canopy transpiration of Pinus sylvestris var. mongolica in a sparse wood grassland in the semiarid sandy region of Northeast China
复制标题
樟子松冠层蒸腾作用
DOI：
10.1016/j.agrformet.2017.12.260
复制
发表时间：
2018-03
影响因子：
6.2
通讯作者：
Wang Kai
中科院分区：
文献类型：
--
作者：
Song Lining;Zhu Jiaojun;Li Mingcai;Zhang Jinxin;Zheng Xiao;Wang Kai
在半干旱沙地生态系统中，水分是决定樟子松在疏林草原上生存和生长的最重要因素。然而，关于疏林草原樟子松的冠层蒸腾作用及其对生态系统水分循环的影响却知之甚少。本研究利用树干液流技术，结合2011年和2012年连续两个生长季的气候因子和土壤水分观测，对疏林草原樟子松的冠层蒸腾作用进行了量化研究。结果表明，2011年和2012年的冠层日蒸腾量分别为0.02~0.27 mm/d−1和0.01~0.29 mm/d−1，平均值分别为0.14和0.15 mm/d−1。日蒸腾量随着太阳辐射和水汽压差的增加而显著增加，在两个观测年的水汽压差≥1.5kPa时趋于平稳。虽然2011年8月和9月的降水量和土壤水分低于2012年，但2011年这两个月的林冠蒸腾量并不比2012年减少，这表明2011年8月和9月树木能够利用地下水。在整个生长季中，2011年和2012年的冠层累计蒸腾量分别为20.9和22.9 mm，分别占降水量的6.6%和4.5%(316.7和510.3 mm)，占蒸散量的8.0%和6.1%(260.5和372.7 mm)，说明冠层蒸腾在生态系统水分收支中所占的比例很小。因此，这两年的水收支是平衡的。这些结果表明，稀林草原的樟子松可以利用地下水维持冠层蒸腾，水分供应能够满足生长所需的蒸腾作用，因此在目前的水分条件下，稀林草原的樟子松可以保持稳定。
In a semiarid sandy ecosystem, water is the most important factor in determining survival and growth of Mongolian pine (Pinus sylvestrisvar.mongolica) in a sparse wood grassland. However, little is known about canopy transpiration of the Mongolian pine in the sparse wood grassland and its influence on the ecosystem water cycling. In this study, we quantified canopy transpiration of Mongolian pine in a sparse wood grassland by using sap flow techniques in combination with observations of climatic factors and soil moisture during two consecutive growing seasons in 2011 and 2012. Results showed that daily canopy transpiration ranged from 0.02 to 0.27 mm day−1and 0.01 to 0.29 mm day−1, with mean values of 0.14 and 0.15 mm day−1in 2011 and 2012, respectively. Daily canopy transpiration increased significantly with solar radiation and vapor pressure deficit, and tended to level off at vapor pressure deficit ≥1.5 kPa in both observation years. Although precipitation and soil moisture in August and September were lower in 2011 than in 2012, monthly canopy transpiration in these two months of 2011 were no less than that in 2012, suggesting that trees were able to tap groundwater in August and September of 2011. Throughout the growing seasons, the accumulated canopy transpiration was 20.9 and 22.9 mm in 2011 and 2012, respectively, occupying 6.6 and 4.5% of precipitation (316.7 and 510.3 mm) and 8.0 and 6.1% of evapotranspiration (260.5 and 372.7 mm), indicating that canopy transpiration accounted for a small proportion of the ecosystem water budget. Thus, water budget was balanced in both years. These findings suggest that Mongolian pine in a sparse wood grassland could use groundwater to maintain the canopy transpiration, and the water supply could satisfy the transpiration requirements for growth, therefore, Mongolian pine in a sparse wood grassland could maintain stable under current water conditions.
登录
查看更多内容
影响因子：
6.7
作者：
Aranda, Ismael;Forner, Alicia;Valladares, Fernando
通讯作者：
Valladares, Fernando
科尔沁沙地植树樟子松后土地覆盖变化对土壤化学和生物性质的影响
影响因子：
4.9
作者：
Hu, Y. L.;Zeng, D. H.;Chang, S. X.;Fan, Z. P.
通讯作者：
Fan, Z. P.
我国长三角地区液流密度与环境因子的关系
影响因子：
2.9
作者：
Liu Xin;Zhang Bo;Zhuang Jia-Yao;Han Cheng;Zhai Lu;Zhao Wen-Rui;Zhang Jin-Chi
通讯作者：
Zhang Jin-Chi
DOI：
--
发表时间：
2008
期刊：
Journal of Beijing Forestry University
影响因子：
--
作者：
Niu Li;Yue Guang-yang;Z. Ha-lin
通讯作者：
Niu Li;Yue Guang-yang;Z. Ha-lin
影响因子：
3.7
作者：
E. Ungar;E. Rotenberg;N. Raz‐Yaseef;S. Cohen;D. Yakir;G. Schiller
通讯作者：
E. Ungar;E. Rotenberg;N. Raz‐Yaseef;S. Cohen;D. Yakir;G. Schiller