| 毛乌素沙地生物结皮覆盖土壤碳通量 日动态特征及其影响因子 |
| 李炳垠1; 卜崇峰1,3; 李宜坪2; 李新凯2,3
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| 2018
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发表期刊 | 水土保持研究
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卷号 | 25期号:4页码:174-180 |
摘要 | 生物结皮是干旱半干旱地区重要的地表景观,它能够进行光合作用和呼吸作用,对荒漠生态系统的碳循环具
有重要影响。研究以毛乌素沙地广泛分布的藓类、藻类结皮为研究对象,采用 Li - 8100 土壤碳通量观测系统,探讨了
不同类型生物结皮日变化特征及其与环境因子之间关系。结果表明:( 1 )生物结皮具有较高生理活性时,能够显著降
低土壤 CO 2 通量,藓类结皮的土壤呼吸速率和光合速率均显著(
p <0. 01 )高于藻类结皮。( 2 )生物结皮光合速率日
变化趋势近似为双峰曲线,峰值出现在 9 : 00 , 16 : 00 左右;生物结皮土壤呼吸速率的日变化趋势呈单峰曲线,于 12 : 00
左右达到峰值。( 3 )相关分析表明,
2cm 深度处的土壤含水量和空气湿度对生物结皮光合速率影响最为显著; 2cm
处的土壤温度和含水量对生物结皮土壤呼吸速率影响最为显著。 |
其他摘要 | Biocrust , a community of cyanobacteria , lichens , and mosses that live on the soil surface , is a criti -
cal part of land cover types in most arid and semi - arid regions.It can play a significant role in carbon fluxes
and exchange in desert ecosystems through their own photosynthesis and respiration.In the present study ,
we used two dominant biocrust types ( moss and algae ) found in the Mu Us Sandland.The diurnal dynamic of
soil carbon flux under the effects of biocrusts at different succession stages was measured by using a modified
LI - 8100automated CO 2 flux system , and the effects of environmental factors on photosynthesis and respira -
tion of biocrust were analyzed.The main results include :( 1 ) the biocrust with physiological activity can sig -
nificantly reduce CO 2 flux of soil and both the photosynthetic rate
( P n ) and respiration rate ( DR ) of moss
crust were significantly higher ( p <0.
01 ) than those of the algae crust ;( 2 ) the diurnal variation of photosyn -
thetic rate of biocrust was a typical bimodal curve , with the peaks appearing at 9 : 00and 16 : 00 ; and the diur -
nal variation of soil respiration rate followed a single - peak curve , with the peaks appearing at 12 : 00 ;( 3 ) the
correlation analysis result indicated that the soil water content in the depth of 2cm and air humidity had the
most significant effect on the photosynthetic rate of the biocrust ; the soil temperature and water content in
the depth of 2cm had the most significant effect on the respiration rate. |
关键词 | 毛乌素沙地
生物结皮
土壤碳通量
环境因子
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收录类别 | 中文核心期刊要目总览
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语种 | 中文
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文献类型 | 期刊论文
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条目标识符 | sbir.nwafu.edu.cn/handle/361005/10324
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专题 | 水保所知识产出(1956---)
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作者单位 | 1.西北农林科技大学 水土保持研究所 2.中国科学院 水利部 水土保持研究所 3.西北农林科技大学 水利与建筑工程学院
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推荐引用方式 GB/T 7714 |
李炳垠,卜崇峰,李宜坪,等. 毛乌素沙地生物结皮覆盖土壤碳通量 日动态特征及其影响因子[J]. 水土保持研究,2018,25(4):174-180.
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APA |
李炳垠,卜崇峰,李宜坪,&李新凯.(2018).毛乌素沙地生物结皮覆盖土壤碳通量 日动态特征及其影响因子.水土保持研究,25(4),174-180.
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MLA |
李炳垠,et al."毛乌素沙地生物结皮覆盖土壤碳通量 日动态特征及其影响因子".水土保持研究 25.4(2018):174-180.
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毛乌素沙地生物结皮覆盖土壤碳通量日动态特征及其影响因子_李炳垠.pdf
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