Soil respiration responses to soil physiochemical properties in urban different green-lands: A case study in Hefei, China

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• 作者：Xiao Tao ; Jun Cui ; Yunze Dai ; Zefu Wang ; Xiaoniu Xu ; ^{xnxu2007@ahau.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Urban soil ; Soil respiration ; Green-land type ; Soil properties ; Environmental factors
• 刊名：International Soil and Water Conservation Research
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：4
• 期：3
• 页码：224-229
• 全文大小：887 K

文摘

Soil respiration (R_S) is an important carbon budget in urban ecosystem. In order to better understand the limiting factors affecting urban soil respiration, we measured R_S, soil temperature, soil moisture content, soil organic carbon (SOC), nitrogen (N), C/N, dissolved organic carbon (DOC), microbial biomass carbon (MBC), NO₃⁻-N, NH₄⁺-N, P and fine root biomass from twelve sites of four green-land types (campus green-land, park green-land, residential green-land and factory green-land) for two years in built-up areas of Hefei, China. The results showed that average annual R_S was significantly lower in the residential green-land (1.35 μmol m⁻² s⁻¹) than in the campus (2.64 μmol m⁻² s⁻¹) and park (2.51 μmol m⁻² s⁻¹) green-lands. R_S positively increased with soil temperature at the range of 2.01–31.26 °C, and Q₁₀ values ranged from 1.48 to 1.65 in the four types of green-lands. Soil moisture (18–25%) showed significantly positive correlation with soil respiration (P<0.01). When precipitation occurred frequently in wet summer, soil moisture served as the dominant control on R_S variations. R_S was positively related with SOC, NO₃⁻-N, P and fine root biomass (diameter <2 mm), while negatively correlated with DOC at 0–10 cm depth. Our results indicate that decreasing R_S may be an optional way to increase carbon sequestration potential for urban ecosystem, and this can be achieved by regulating green-land types and applying appropriate soil nutrients maintenance practices.