Sources of water used by Pinus sylvestris var. mongolica trees based on stable isotope measurements in a semiarid sandy region of Northeast China
Sources of water used by Pinus sylvestris var. mongolica trees based on stable isotope measurements in a semiarid sandy region of Northeast China
复制标题
樟子松 (Pinus sylvestris var.) 使用的水源。
DOI：
10.1016/j.agwat.2015.10.018
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发表时间：
2016-01
影响因子：
6.7
通讯作者：
Lv, Linyou
中科院分区：
文献类型：
--
作者：
Zhu, Jiaojun;Li, Mingcai;Zhang, Jinxin;Lv, Linyou
我国北方半干旱桑迪樟子松（Pinussylvestrisvar.mongolica）林的枯梢发生在30-35年生左右。水分不足是这种枯死的最重要原因，但松树使用的水源知之甚少。本研究的目的是确定樟子松枯梢病的水源利用情况，并探讨其发生机制。2010年和2011年连续两年分析了29年生油松林枝木质部、土壤、雨水和地下水中水分的δD和δ 18 O。土壤含水量（SWC），树木蒸腾和地下水位同步测量。结果表明，树木在春季（4 - 5月）和秋季（9 - 10月）利用土壤水分。相比之下，树木利用土壤水和地下水在夏季（6月至8月）在两个观察年。在土壤含水量较高时（6.6%），树木对土壤水分的利用率为70.1%，而在土壤含水量较低时（3.5%），树木对地下水的利用率为55.8%。随着降雨量从580 mm减少到460 mm，地下水对树木蒸腾的贡献从10.0%增加到14.4%，平均为12.2%。而在长期年降雨量的60%的年份，土壤含水量的平均值仅为2.7%。这些研究结果表明，随着降雨量的减少，地下水越来越重要。因此，在降雨量极低的年份，地下水应该是松树生长和存活的主要水源。樟子松林枯梢病是在降雨量极低年份地下水位突然下降时发生的。
Dieback of Mongolian pine (Pinus sylvestrisvar.mongolica) forests in the semiarid sandy region of northern China occurs when the trees are approximately 30–35 years old. Water deficit was the most important reason for this dieback, but the water sources used by pine trees are poorly understood. We aimed to identify the water sources utilized by pine trees and to explore the potential mechanisms inducing Mongolian pine dieback. The δD and δ18O of water in twig xylem, soil, rain and groundwater were analyzed in a 29-year-old pine stand during two consecutive years 2010 and 2011. Soil water content (SWC), tree transpiration and groundwater level were measured concurrently. The results demonstrated that trees utilized soil water in spring (April–May) and autumn (September–October). In contrast, trees used both soil water and groundwater in summer (June–August) during the two observed years. Additionally, 70.1% of water used by trees came from soil water when the SWC was high (6.6%), but 55.8% of water used by trees came from groundwater when the SWC was low (3.5%). The groundwater contribution to tree transpiration increased from 10.0% to 14.4% with the rainfall decreasing from 580 mm to 460 mm, with a mean value of 12.2%. However, in the year of 60% of the long-term annual rainfall, the mean SWC only was 2.7%. These findings indicate that groundwater was increasingly critical with decreasing rainfall. Groundwater should be thus the primary water source for the growth and survival of pine trees in the years of extreme low rainfall. The dieback of Mongolian pine forests occurred when the groundwater level declined suddenly in the years of extreme low rainfall.
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影响因子：
2.7
作者：
Ping Wang;Yi-chi Zhang;Jing-Jie Yu;G. Fu;Fei Ao
通讯作者：
Ping Wang;Yi-chi Zhang;Jing-Jie Yu;G. Fu;Fei Ao
影响因子：
2.7
作者：
A. West;K. Hultine;K. Burtch;J. Ehleringer
通讯作者：
A. West;K. Hultine;K. Burtch;J. Ehleringer
影响因子：
4.9
作者：
Ellsworth, Patrick Z.;Williams, David G.
通讯作者：
Williams, David G.
DOI：
10.1007/s00468-013-0873-1
发表时间：
2013-04
期刊：
Trees
影响因子：
--
作者：
Y. F. Wei;J. Fang;S. Liu;X. Y. Zhao;S. G. Li
通讯作者：
Y. F. Wei;J. Fang;S. Liu;X. Y. Zhao;S. G. Li
影响因子：
0.3
作者：
Puertolas Jaime;Pardos Marta;Jimenez Maria Dolores;A. Ismael;Pardos Jose Alberto
通讯作者：
Puertolas Jaime;Pardos Marta;Jimenez Maria Dolores;A. Ismael;Pardos Jose Alberto