植物生态学报 ›› 2008, Vol. 32 ›› Issue (1): 123-132.DOI: 10.3773/j.issn.1005-264x.2008.01.014
刘峻杉1, 高琼1,*(), 郭柯2, 刘新平3, 邵振艳1, 张智才1
收稿日期:
2006-12-25
接受日期:
2007-06-11
出版日期:
2008-12-25
发布日期:
2008-01-30
通讯作者:
高琼
作者简介:
* E-mail: gaoq@bnu.edu.cn感谢邱国玉教授和李小雁教授在模型计算和验证过程中提出的宝贵建议
基金资助:
LIU Jun-Shan1, GAO Qiong1,*(), GUO Ke2, LIU Xin-Ping3, SHAO Zhen-Yan1, ZHANG Zhi-Cai1
Received:
2006-12-25
Accepted:
2007-06-11
Online:
2008-12-25
Published:
2008-01-30
Contact:
GAO Qiong
摘要:
裸沙表面的蒸发虽然是一个物理问题,但对于沙地植被演替的初始阶段非常重要。目前存在的地表蒸发的机理性模型大多是瞬时或者短时期的,而年尺度以上的蒸发量与降水和蒸发驱动下的土壤水分系统的状态变化及其对蒸发过程的反馈密切相关。一些估算毛乌素年蒸发量的实验结果之间分歧很大且缺乏准确的机理性解释。该文利用生态系统模型中的土壤水分运动和蒸发模块计算了毛乌素裸沙丘从日到年际尺度的实际蒸发量,发展了一个以单次降雨量和降雨频率为驱动因素的降雨-蒸发模型对年蒸发量进行简单的估算,并研究了年蒸发量对降雨格局的响应。结果表明毛乌素裸沙丘的多年平均蒸发量为166 mm,占多年平均降雨量的56%。虽然研究区1959~1992年降雨总量无显著变化趋势,但是裸沙丘斑块的实际蒸发量呈现较明显的增加趋势(1.30 mm·a-1)。小降雨事件对蒸发量贡献的显著增加(0.69 mm·a-1)是导致实际蒸发量增大的重要原因。大强度降雨事件的频度和雨量对降雨总量的贡献要远高于对蒸发总量的贡献,小于12 mm的降雨事件在年际比较稳定,很大程度上保证了年蒸发量100 mm左右的基数值。这些因素使得年蒸发量的变异程度小于年降雨量的变异程度。由于降雨格局的年际变化会对蒸发量产生直接的影响,降雨-蒸发模型可以相对有效地预测年度蒸发量,而用年降雨量预测年蒸发量误差较大。
刘峻杉, 高琼, 郭柯, 刘新平, 邵振艳, 张智才. 毛乌素裸沙丘斑块的实际蒸发量及其对降雨格局的响应. 植物生态学报, 2008, 32(1): 123-132. DOI: 10.3773/j.issn.1005-264x.2008.01.014
LIU Jun-Shan, GAO Qiong, GUO Ke, LIU Xin-Ping, SHAO Zhen-Yan, ZHANG Zhi-Cai. ACTUAL EVAPORATION OF BARE SAND DUNES IN MAOWUSU, CHINA AND ITS RESPONSE TO PRECIPITATION PATTERN. Chinese Journal of Plant Ecology, 2008, 32(1): 123-132. DOI: 10.3773/j.issn.1005-264x.2008.01.014
图1 裸沙丘土壤水分剖面的模拟 空心图形代表模拟结果,实心图形代表测量结果;圆形代表早春,方形代表夏季41 mm降水后一天,三角形代表秋末
Fig.1 Comparison of simulated and observed soil moisture profile of bare sand dune Open figures represent simulated results, closed figures represent observed results. Circles represent soil moisture in the early spring, squares in the day after 41 mm rainfall in the middle summer, triangles in the late autumn
参数 Parameter | 符号 Symbol | 值 Value | 单位 Units |
---|---|---|---|
饱和含水量 Volumetric soil water content at saturation | θs | 0.39 | m·m-1 |
残余含水率 Residual volumetric soil water content | θr | 0.01 | m·m-1 |
土壤水分特征参数 Fitting parameter for soil water retention curve | α | 0.029 3 | cm-1 |
土壤水分特征参数 Fitting parameter for soil water retention curve | n | 1.751 8 | - |
饱和导水率 Soil hydraulic conductivity at saturation | Ks | 14.2 | m·d-1 |
蒸发调整系数 Fitting parameter for evaporation | β | 6 | - |
持水参数 Parameter for water-holding | θf | 0.13 | m·m-1 |
表1 模型参数
Table 1 Model parameters used in simulations
参数 Parameter | 符号 Symbol | 值 Value | 单位 Units |
---|---|---|---|
饱和含水量 Volumetric soil water content at saturation | θs | 0.39 | m·m-1 |
残余含水率 Residual volumetric soil water content | θr | 0.01 | m·m-1 |
土壤水分特征参数 Fitting parameter for soil water retention curve | α | 0.029 3 | cm-1 |
土壤水分特征参数 Fitting parameter for soil water retention curve | n | 1.751 8 | - |
饱和导水率 Soil hydraulic conductivity at saturation | Ks | 14.2 | m·d-1 |
蒸发调整系数 Fitting parameter for evaporation | β | 6 | - |
持水参数 Parameter for water-holding | θf | 0.13 | m·m-1 |
深度 Depth (m) | 实验( | 模拟 Simulations | |||
---|---|---|---|---|---|
平均 Average | 冬季 Winter | 平均 Average | 冬季 Winter | ||
1 | 77.9±3.6 | 59.7±5.4 | 76.3 | 66.1 | |
1.5 | 118.1±5.2 | - | 113.2 | 105.7 |
表2 裸沙丘1和1.5 m内储水量
Table 2 Water reserves within 1 and 1.5 m
深度 Depth (m) | 实验( | 模拟 Simulations | |||
---|---|---|---|---|---|
平均 Average | 冬季 Winter | 平均 Average | 冬季 Winter | ||
1 | 77.9±3.6 | 59.7±5.4 | 76.3 | 66.1 | |
1.5 | 118.1±5.2 | - | 113.2 | 105.7 |
月份 Month | 降雨量 Rainfalls (mm) | 潜在蒸散量 Potential evapotranspiration (mm) | 实际蒸发量 Evaporation (mm) |
---|---|---|---|
1 | 0 | 54.7 | 2.2 |
2 | 0 | 64.5 | 2.2 |
3 | 0 | 116.7 | 2.8 |
4 | 0 | 235.2 | 2.8 |
5 | 11.5 | 346.7 | 7.2 |
6 | 3.7 | 415.2 | 9.5 |
7 | 80.2 | 316.2 | 31.7 |
8 | 140.7 | 242.3 | 34.6 |
9 | 59.1 | 195.5 | 24.1 |
10 | 40.5 | 115.6 | 12.8 |
11 | 0 | 94.3 | 7.7 |
12 | 0 | 65.4 | 4.0 |
累计Sum | 335.7 | 2 262.3 | 142.9 |
表3 1968年不同月份降雨量与蒸发量
Table 3 Rainfalls and evaporations in the different months of 1968
月份 Month | 降雨量 Rainfalls (mm) | 潜在蒸散量 Potential evapotranspiration (mm) | 实际蒸发量 Evaporation (mm) |
---|---|---|---|
1 | 0 | 54.7 | 2.2 |
2 | 0 | 64.5 | 2.2 |
3 | 0 | 116.7 | 2.8 |
4 | 0 | 235.2 | 2.8 |
5 | 11.5 | 346.7 | 7.2 |
6 | 3.7 | 415.2 | 9.5 |
7 | 80.2 | 316.2 | 31.7 |
8 | 140.7 | 242.3 | 34.6 |
9 | 59.1 | 195.5 | 24.1 |
10 | 40.5 | 115.6 | 12.8 |
11 | 0 | 94.3 | 7.7 |
12 | 0 | 65.4 | 4.0 |
累计Sum | 335.7 | 2 262.3 | 142.9 |
单次降雨量 Single rainfall (mm) | 次数 Times | 最小蒸发量 Minimum evaporation (mm) | 最大蒸发量 Maximum evaporation (mm) |
---|---|---|---|
<5 | 32 | 27.4 | 54.8 |
5~12 | 12 | 39.9 | 79.8 |
>12 | 9 | 38.3 | 76.6 |
累计Sum | 53 | 105.5 | 211.0 |
表4 用降雨-蒸发模型估算的1968年蒸发量
Table 4 Evaporation estimation of 1968 by rainfall-EV model
单次降雨量 Single rainfall (mm) | 次数 Times | 最小蒸发量 Minimum evaporation (mm) | 最大蒸发量 Maximum evaporation (mm) |
---|---|---|---|
<5 | 32 | 27.4 | 54.8 |
5~12 | 12 | 39.9 | 79.8 |
>12 | 9 | 38.3 | 76.6 |
累计Sum | 53 | 105.5 | 211.0 |
单次降雨量 Single rainfall (mm) | 年次数 Annual times | 多年趋势 Tendency (time·a-1) | 对降雨量贡献 Sum for precipitation (mm) | 多年趋势 Tendency (mm·a-1) | 对蒸发量贡献 Sum for evaporation (mm) | 多年趋势 Tendency (mm·a-1) |
---|---|---|---|---|---|---|
<5 | 41.97±9.63 | 0.42** | 60.72±16.55 | 0.82** | 51.61±14.07 | 0.69** |
5~12 | 10.26±3.48 | - | 79.61±27.61 | - | 55.65±19.03 | - |
>12 | 7.74±3.20 | - | 185.30±92.68 | - | 55.89±23.14 | - |
表5 不同降雨强度的发生次数及对降雨总量、蒸发量贡献的多年平均值及趋势
Table 5 Annual frequency, contribution to annual precipitation and actual evaporation, and tendency of different rain types
单次降雨量 Single rainfall (mm) | 年次数 Annual times | 多年趋势 Tendency (time·a-1) | 对降雨量贡献 Sum for precipitation (mm) | 多年趋势 Tendency (mm·a-1) | 对蒸发量贡献 Sum for evaporation (mm) | 多年趋势 Tendency (mm·a-1) |
---|---|---|---|---|---|---|
<5 | 41.97±9.63 | 0.42** | 60.72±16.55 | 0.82** | 51.61±14.07 | 0.69** |
5~12 | 10.26±3.48 | - | 79.61±27.61 | - | 55.65±19.03 | - |
>12 | 7.74±3.20 | - | 185.30±92.68 | - | 55.89±23.14 | - |
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