植物生态学报 ›› 2006, Vol. 30 ›› Issue (1): 83-89.DOI: 10.17521/cjpe.2006.0012
所属专题: 稳定同位素生态学
徐庆1, 刘世荣1, 安树青2,*(), 蒋有绪1, 王中生2, 刘京涛1
收稿日期:
2005-02-01
接受日期:
2005-09-08
出版日期:
2006-02-01
发布日期:
2006-01-30
通讯作者:
安树青
作者简介:
*E-mail:anshq@nju.edu.cn基金资助:
XU Qing1, LIU Shi-Rong1, AN Shu-Qing2,*(), JIANG You-Xu1, WANG Zhong-Sheng2, LIU Jing-Tao1
Received:
2005-02-01
Accepted:
2005-09-08
Online:
2006-02-01
Published:
2006-01-30
Contact:
AN Shu-Qing
摘要:
该文应用氧稳定同位素对四川卧龙巴朗山不同降雨条件下亚高山暗针叶林中降水、林冠穿透水和壤中流的变化动态进行了示踪,结果表明: 1)降水δ18O与林冠穿透水δ18O的差值(用Δ表示)随着日降雨量的增大呈现偏正态结构。降水量<3.20 mm时,Δ<0;当降水量≥3.20 mm时,Δ>0;且当降水量=12.65 mm时,Δ值最大。这是由当时冠层蒸散过程和降水过程相互作用决定的。 2)低降水强度、日平均降水量小和降水连续性差时,壤中流弱且不连续,导致壤中流的氧同位素组成对降水响应速度慢;反之,壤中流强且连续,导致壤中流对降水响应速度加快。当降水量在< 10 mm时,这种响应在降雨后4 d发生;当降水量在10~20 mm时,日平均降水量较大和连续降雨时,这种响应在降雨后2~3 d发生;当降水量在20~30 mm时,这种响应在降水1~2 d发生。发育良好的原始亚高山暗针叶林森林植被对降水分配进行着有效的调控,使得暗针叶林植被储备着不同时期降水、穿透水、壤中流及地下水组成的混合体,使壤中流变化滞后,从而控制植被下游洪水发生。
徐庆, 刘世荣, 安树青, 蒋有绪, 王中生, 刘京涛. 川西亚高山暗针叶林降水分配过程中氧稳定同位素特征. 植物生态学报, 2006, 30(1): 83-89. DOI: 10.17521/cjpe.2006.0012
XU Qing, LIU Shi-Rong, AN Shu-Qing, JIANG You-Xu, WANG Zhong-Sheng, LIU Jing-Tao. ALLOCATION OF PRECIPITATION IN A SUB-ALPINE DARK CONIFEROUS FOREST OF WESTERN SICHUAN USING STABLE OXYGEN ISOTOPES. Chinese Journal of Plant Ecology, 2006, 30(1): 83-89. DOI: 10.17521/cjpe.2006.0012
样地 Plots | 群落类型 Community types | 海拔 Elevation (m) | 地理位置 Location | 坡度 Slope (°) | 土壤特性 Soil characteristics | 叶面积指数 Leaf area index | 郁闭度 Canopy coverage (%) | ||||
---|---|---|---|---|---|---|---|---|---|---|---|
A | 岷江冷杉-箭竹群落 Abies faxoniana-Bshania angiana | 2 750 | 30°51'21″ N, 102°58'19″ E | 50 | 山地暗棕壤 Mountain dark brown forest soil | 3.15 | 75 | ||||
B | 岷江冷杉-箭竹群落 Abies faxoniana-Bshania fangiana | 2 850 | 30°51'16 N, 102°58'20″ E | 35 | 山地棕色暗针叶林土 Mountain brown coniferous forest soil | 4.56 | 85 | ||||
C | 岷江冷杉-杜鹃群落 Abies faxoniana- Rhododen faberi | 2 950 | 30°51'20″ N, 102°58'22″ E | 40 | 山地棕色暗针叶林土 Mountain brown coniferous forest soil | 3.93 | 90 |
表1 四川卧龙亚高山暗针叶林3个样地群落特征和生境特点
Table 1 The characteristics of communities and habitats of sub-alpine dark coniferous forest of Wolong, Sichuan
样地 Plots | 群落类型 Community types | 海拔 Elevation (m) | 地理位置 Location | 坡度 Slope (°) | 土壤特性 Soil characteristics | 叶面积指数 Leaf area index | 郁闭度 Canopy coverage (%) | ||||
---|---|---|---|---|---|---|---|---|---|---|---|
A | 岷江冷杉-箭竹群落 Abies faxoniana-Bshania angiana | 2 750 | 30°51'21″ N, 102°58'19″ E | 50 | 山地暗棕壤 Mountain dark brown forest soil | 3.15 | 75 | ||||
B | 岷江冷杉-箭竹群落 Abies faxoniana-Bshania fangiana | 2 850 | 30°51'16 N, 102°58'20″ E | 35 | 山地棕色暗针叶林土 Mountain brown coniferous forest soil | 4.56 | 85 | ||||
C | 岷江冷杉-杜鹃群落 Abies faxoniana- Rhododen faberi | 2 950 | 30°51'20″ N, 102°58'22″ E | 40 | 山地棕色暗针叶林土 Mountain brown coniferous forest soil | 3.93 | 90 |
δ18O | 降水 Rainfall | 穿透水 Throughfall | 壤中流 Soilflow |
---|---|---|---|
降 水 Rainfall | - | 1.872 5 | -0.794 8 |
穿透水 Throughfall | -1.872 5 | - | -2.667 4* |
壤中流 Soil flow | 0.794 8 | 2.667 4* | - |
表2 降水、穿透水及壤中流的δ18O 均值比较
Table 2 Mean difference δ18O of rainfall, thoughtfall and soil flow
δ18O | 降水 Rainfall | 穿透水 Throughfall | 壤中流 Soilflow |
---|---|---|---|
降 水 Rainfall | - | 1.872 5 | -0.794 8 |
穿透水 Throughfall | -1.872 5 | - | -2.667 4* |
壤中流 Soil flow | 0.794 8 | 2.667 4* | - |
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