凋落物添加条件下咸水灌溉对风沙土CO2排放及化学性质的影响

doi:10.13287/j.1001-9332.202011.003

摘要/Abstract

摘要： 沙拐枣作为塔克拉玛干沙漠公路防护林主要优势物种之一,其凋落物在该区域的碳循环过程中具有重要作用。采用室内培养试验测定了沙拐枣凋落物添加后,在25%、50%、75%、100%田间持水量的咸水(SW)和淡水(FW)灌溉条件下,风沙土CO₂排放、土壤有机碳(SOC)、可溶性有机碳(DOC)、pH和电导率(EC)的动态变化。结果表明: 咸水灌溉对土壤CO₂排放具有抑制作用,在4种土壤含水量处理下,淡水灌溉比咸水灌溉的CO₂累积排放量增加1.9%～29.1%;土壤CO₂累积排放量随土壤含水量的增加而升高;在沙拐枣凋落物添加条件下,SOC在前期迅速下降,但后期所有处理SOC均逐渐升高后趋于稳定;培养结束时,各处理DOC含量比培养前提高了41.3%～92.4%;在培养结束时各处理与培养前相比pH升高了0.20～0.35;EC随土壤含水量的增加而升高,培养结束时在4种含水量条件下,咸水灌溉下EC比培养前增加了0.11～0.79 mS·cm^-1,而淡水灌溉下EC比培养前有增有减。土壤CO₂累积排放量与SOC、DOC、pH呈显著正相关,但与土壤含水量相关性不显著。凋落物添加条件下咸水灌溉以及较低的含水量条件均能抑制风沙土CO₂的排放,EC受灌溉水质和土壤含水量的影响较大。

关键词: 凋落物添加, 土壤含水量, 咸水灌溉, CO₂排放

Abstract: Calligonum mongolicum is one of the dominant species in the Taklimakan Desert highway shelterbelt, the litter of which plays an important role in carbon cycling. After litter addition, we carried out a laboratory incubation experiment to investigate the dynamics of soil CO₂ emission, soil organic carbon (SOC), soluble organic carbon (DOC), pH, and electrical conductivity (EC) under the condition of salt water (SW) and fresh water (FW) with field water holding capacity of 25%, 50%, 75%, and 100%. The results showed that saline water irrigation had an inhibitory effect on soil CO₂ emission. Under the four soil water content treatments, the cumulative CO₂ emission of freshwater irrigation increased by 1.9%-29.1% compared with that of saline irrigation. Cumulative soil CO₂ emissions increased with increasing soil water content. With litter addition, SOC decreased rapidly in the early stage, then gradually increased, and finally tended to be stable. The DOC contents of each treatment following the incubation increased by 41.3%-92.4% compared with that before the incubation. At the end of incubation, soil pH of each treatment increased by 0.20-0.35. The EC increased with the increases of soil water content. Under the four water content conditions and compared with the situation before the incubation, the EC values irrigated with SW increased by 0.11-0.79 mS·cm^-1, while those with FW increased or decreased at the end of incubation. Cumulative soil CO₂ emission was positively correlated with SOC, DOC, and pH, but not with soil water content. Both saline irrigation and lower water content could inhibit CO₂ emission of aeolian sandy soil under litter addition, while EC was significantly affected by the quality of irrigation water and soil water content.

Key words: litter addition, soil water content, saline irrigation, CO₂ emission

张少磊, 张建国, 常闻谦, 吴路遥, 张阿凤. 凋落物添加条件下咸水灌溉对风沙土CO₂排放及化学性质的影响[J]. 应用生态学报, 2020, 31(11): 3639-3646.

ZHANG Shao-lei, ZHANG Jian-guo, CHANG Wen-qian, WU Lu-yao, ZHANG A-feng. Effects of saline irrigation on CO₂ emission and chemical properties of aeolian sandy soil under litter addition[J]. Chinese Journal of Applied Ecology, 2020, 31(11): 3639-3646.

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凋落物添加条件下咸水灌溉对风沙土CO₂排放及化学性质的影响

Effects of saline irrigation on CO₂ emission and chemical properties of aeolian sandy soil under litter addition

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