An evaluation of abiotic carbon sinks in deserts

被引：75

作者：

Schlesinger, William H. ^{[1
,2
]}

机构：

[1] Duke Univ, Nicholas Sch Environm, Durham, NC 27708 USA

[2] Cary Inst Ecosyst Studies, Box AB, Millbrook, NY 12545 USA

来源：

GLOBAL CHANGE BIOLOGY | 2017年 / 23卷 / 01期

关键词：

carbon sequestration; deserts; groundwater; missing sink; soil carbon; NET ECOSYSTEM CO2; MOJAVE-DESERT; CHIHUAHUAN DESERT; SEMIARID ECOSYSTEMS; DIOXIDE FLUX; SOIL; VARIABILITY; SEQUESTRATION; EXCHANGE; DYNAMICS;

D O I：

10.1111/gcb.13336

中图分类号：

X176 [生物多样性保护];

学科分类号：

090705 ;

摘要：

Recent field studies have reported anomalous CO2 uptake using eddy-covariance techniques in arid and semiarid ecosystems. The rates of CO2 uptake are incompatible with changes in situ of organic carbon pools. Here, I examine several potential mechanisms of abiotic CO2 uptake in arid and semiarid soils: atmospheric pressure pumping, carbonate dissolution, and percolation of soil water through the vadose zone. Each mechanism is deemed inadequate to explain the observations of the eddy-covariance systems, which must now be questioned for their accuracy in desert ecosystems.

引用

页码：25 / 27

页数：3

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