中国沙漠 ›› 2021, Vol. 41 ›› Issue (2): 100-108.DOI: 10.7522/j.issn.1000-694X.2020.00111
韩丹1,2(), 李玉霖1(
), 杨红玲1,2, 宁志英1,2, 张子谦1,2
收稿日期:
2020-06-24
修回日期:
2020-10-19
出版日期:
2021-03-20
发布日期:
2021-03-26
通讯作者:
李玉霖
作者简介:
李玉霖(E-mail: lyulin@gmail.com)基金资助:
Dan Han1,2(), Yulin Li1(
), Hongling Yang1,2, Zhiying Ning1,2, Ziqian Zhang1,2
Received:
2020-06-24
Revised:
2020-10-19
Online:
2021-03-20
Published:
2021-03-26
Contact:
Yulin Li
摘要:
温度和降水是干旱半干旱区土壤呼吸的重要扰动因子,全球气候变化导致的未来干旱半干旱区增温和降水变率增大对土壤呼吸有着重要影响。研究通过人工设置P16×2.5mm、P8×5mm、P4×10mm、P2×20mm、P1×40mm的降雨频率梯度和增温2 ℃左右的控制试验,探讨不同降雨频率和增温处理对干旱半干旱区土壤呼吸的影响,以及土壤呼吸与土壤温湿度的关系及其对降雨频率改变的响应。结果表明:降雨频率和增温单独对土壤呼吸具有极显著影响(P<0.001),但是两者之间并无交互作用(P>0.5);在降雨量一定的情况下,土壤呼吸速率随着降雨频率的减小而减小,即多频率小降雨事件激发的土壤呼吸速率大于小频率大降雨事件;增温促进土壤呼吸,提高了约11%的土壤呼吸。本结果有助于对未来干旱半干旱地区全球变暖背景下降雨格局的改变对土壤呼吸产生的影响进行预测,同时也为进一步估算该区域生态系统的碳收支提供参考数据。
中图分类号:
韩丹, 李玉霖, 杨红玲, 宁志英, 张子谦. 模拟增温和改变降雨频率对干旱半干旱区土壤呼吸的影响[J]. 中国沙漠, 2021, 41(2): 100-108.
Dan Han, Yulin Li, Hongling Yang, Zhiying Ning, Ziqian Zhang. Effects of simulated temperature increase and change of rainfall frequency on soil respiration in arid and semi-arid areas[J]. Journal of Desert Research, 2021, 41(2): 100-108.
土壤性状 | 测定值 | 土壤性状 | 测定值 |
---|---|---|---|
黏粉粒含量/% | 9.6 | 有机碳含量/(g·kg-1) | 1.72 |
极细砂含量/% | 14.8 | 全氮含量/(g·kg-1) | 0.22 |
中粗砂含量/% | 75.6 | 碳氮比 | 7.8 |
最大持水量/% | 5.9 | pH值 | 7.84 |
容重/(g·cm-3) | 1.59 | 电导率/(μS·cm-1) | 23 |
表1 培养土壤基本性状(0—10 cm)
Table 1 Physical and chemical properties (0-10 cm) of incubated soil
土壤性状 | 测定值 | 土壤性状 | 测定值 |
---|---|---|---|
黏粉粒含量/% | 9.6 | 有机碳含量/(g·kg-1) | 1.72 |
极细砂含量/% | 14.8 | 全氮含量/(g·kg-1) | 0.22 |
中粗砂含量/% | 75.6 | 碳氮比 | 7.8 |
最大持水量/% | 5.9 | pH值 | 7.84 |
容重/(g·cm-3) | 1.59 | 电导率/(μS·cm-1) | 23 |
处理 | 温度/℃ | 湿度/% | ||
---|---|---|---|---|
F | P | F | P | |
小区 | 1.422 | >0.1 | 1.627 | >0.1 |
增温 | 1820.557 | <0.01 | .073 | >0.5 |
降雨频率 | 42.351 | <0.01 | 561.883 | <0.01 |
增温×降雨频率 | 0.000 | >0.5 | 0.080 | >0.5 |
表2 增温和降雨频率对土壤温湿度的影响
Table 2 Effect of increasing temperature and rainfall frequency on soil temperature and humidity
处理 | 温度/℃ | 湿度/% | ||
---|---|---|---|---|
F | P | F | P | |
小区 | 1.422 | >0.1 | 1.627 | >0.1 |
增温 | 1820.557 | <0.01 | .073 | >0.5 |
降雨频率 | 42.351 | <0.01 | 561.883 | <0.01 |
增温×降雨频率 | 0.000 | >0.5 | 0.080 | >0.5 |
处理 | F | P |
---|---|---|
温度 | 73.219 | <0.01 |
降雨频率 | 121.770 | <0.01 |
温度×降雨频率 | 0.070 | >0.5 |
表3 增温和降雨频率对土壤呼吸的影响
Table 3 Effect of increasing temperature and rainfall frequency on soil respiration
处理 | F | P |
---|---|---|
温度 | 73.219 | <0.01 |
降雨频率 | 121.770 | <0.01 |
温度×降雨频率 | 0.070 | >0.5 |
处理 | 方程 | R2 | P | |
---|---|---|---|---|
降雨频率 | P16×2.5mm | y = 0.0052x2 - 0.18x + 5.3306 | 0.1299 | <0.01 |
P8×5mm | y = 0.1054x2 - 1.7313x + 10.708 | 0.399 | <0.01 | |
P4×10mm | y = 0.0248x2 - 0.0553x + 2.089 | 0.9046 | <0.01 | |
P2×20mm | y = 0.0111x2 + 0.165x + 1.3561 | 0.9474 | <0.01 | |
P1×40mm | y= 0.0128x2 + 0.1674x + 1.3466 | 0.898 | <0.01 | |
温度 | 增温 | y = 1.1818e0.0421x | 0.0547 | <0.01 |
不增温 | y = 1.0536e0.0449x | 0.0543 | <0.01 |
表4 土壤呼吸速率与土壤温湿度的回归方程
Table 4 Regression equation of soil respiration rate and soil temperature and humidity
处理 | 方程 | R2 | P | |
---|---|---|---|---|
降雨频率 | P16×2.5mm | y = 0.0052x2 - 0.18x + 5.3306 | 0.1299 | <0.01 |
P8×5mm | y = 0.1054x2 - 1.7313x + 10.708 | 0.399 | <0.01 | |
P4×10mm | y = 0.0248x2 - 0.0553x + 2.089 | 0.9046 | <0.01 | |
P2×20mm | y = 0.0111x2 + 0.165x + 1.3561 | 0.9474 | <0.01 | |
P1×40mm | y= 0.0128x2 + 0.1674x + 1.3466 | 0.898 | <0.01 | |
温度 | 增温 | y = 1.1818e0.0421x | 0.0547 | <0.01 |
不增温 | y = 1.0536e0.0449x | 0.0543 | <0.01 |
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