新疆天山北坡典型草地土壤无机碳特征
发布时间：2019-06-27 07:42
【摘要】：干旱区典型草地土壤无机碳(soil inorganic carbon)的分布特征对于整个草地生态系统碳循环的研究具有重要的意义。本文基于新疆天山北坡8种典型草地剖面土壤无机碳含量的实测数据,分析了天山北坡垂直带草地类型与土壤类型的SIC分布特征及其影响因素,这对研究草地生态系统碳收支平衡和碳循环机制具有重要的意义。结果表明:(1)1m土层,高寒草甸、温性山地草甸、温性草甸草原、温性草原、温性荒漠草原、温性草原化荒漠、温性荒漠、低地盐化草甸的SIC平均含量分别为:0.02、7.72、9.74、8.55、9.46、7.38、6.30、15.00 g·kg-1,其无机碳密度(SICD)分别为0.01、7.98、10.18、7.13、7.57、5.12、6.80、14.20 kg·m-2,平均SICD为7.37 kg·m-2,最大变异系数出现在0-20 cm土层。高寒草甸SIC含量及密度在土壤剖面上差异不明显;温性山地草甸SIC含量随着土层深度的加深表现为先增后减的趋势,而其SICD则表现为逐渐增大的趋势,SIC主要储存在50-100 cm,占0-100 cm土层的64.84%;其它6种草地SIC含量及密度随着土层深度的加深表现为先增后减的趋势,主要分布在土层0-50 cm,所占0-100cm土层的50.04-75.87%。(2)不同土壤类型间的SIC分布差异明显,高山草甸土与风沙土SIC含量及密度随着土层深度的加深无明显变化。在0-70 cm土层灰棕漠土的SIC含量无明显变化,但在底层70-100 cm SIC含量最低,而其SICD则表现为先增后减的趋势;盐化草甸土的SIC含量与其SICD均随着土层深度的加深表现为先增后减;随着土层深度的加深黑钙土、灰漠土、栗钙土、盐化草甸土、棕钙土SIC含量表现为先增后减的趋势,而其SICD则表现为增加的趋势。深度1m内,风沙土、高山草甸土、黑钙土、灰漠土、灰棕漠土、栗钙土、盐化草甸土、棕钙土的平均SIC含量分别为:2.87、0.01、8.34、10.81、4.86、8.44、15.04、8.61 g·kg-1,SICD分别为:4.25、0.01、8.24、10.50、3.70、7.44、14.20、7.47kg m-2,平均SICD为7.18 kg·m-2。(3)pH与SIC含量在0-10 cm土层呈极显著正相关,在土层70-100 cm则达到极显著负相关;而与SICD在0-20 cm达到极显著正相关,20-50 cm呈显著正相关。土壤容重与SIC含量在土层30-50cm达到显著负相关,土层50-100 cm达到极显著负相关;与SICD在表层0-5 cm呈显著正相关,而在土层70-100 cm则达到显著负相关。在0-30、0-50 cm土层内土壤SIC含量及SICD与年降水和海拔均呈负相关关系。(4)整个天山北坡0-30、0-50、0-100 cm土层SICD由西向东呈先增后减再增的趋势,均在精河低地盐化草甸地区SICD达到最大,乌鲁木齐南部与奇台北部的高寒草甸SICD最低。
[Abstract]:The distribution characteristics of inorganic carbon (soil inorganic carbon) in typical grassland soils in arid area are of great significance for the study of carbon cycle in the whole grassland ecosystem. Based on the measured data of soil inorganic carbon content in eight typical grassland profiles on the northern slope of Tianshan Mountain, this paper analyzes the SIC distribution characteristics and influencing factors of grassland types and soil types in the vertical zone of the northern slope of Tianshan Mountain, which is of great significance to the study of carbon revenue and expenditure balance and carbon cycle mechanism in grassland ecosystem. The results showed that: (1) the average SIC contents of 1m soil layer, alpine meadow, warm mountain meadow, temperate meadow grassland, temperate desert steppe, temperate desert and lowland salinized meadow were 0.02, 7.72, 9.74, 8.5, 9.46, 7.38, 15.00 g kg-1, respectively. The inorganic carbon density (SICD) was 0.01, 7.98, 10.18, 7.13, 7.57, 6.80, 14.20 kg 路m -, respectively. The average SICD was 7.37 kg 路m-2, and the maximum coefficient of variation appeared in 0 脳 20 cm soil layer. There was no significant difference in SIC content and density in alpine meadow on soil profile, SIC content in warm mountain meadow increased at first and then decreased with the deepening of soil depth, while SICD increased gradually. SIC was mainly stored in 50 脳 100 cm, accounting for 64.84% of that in 0 脳 100 cm soil layer. The SIC content and density of the other six grasslands increased at first and then decreased with the deepening of soil depth, mainly distributed in the soil layer of 0 / 50 cm, accounting for 50.04 鈮，
本文编号：2506615
[Abstract]:The distribution characteristics of inorganic carbon (soil inorganic carbon) in typical grassland soils in arid area are of great significance for the study of carbon cycle in the whole grassland ecosystem. Based on the measured data of soil inorganic carbon content in eight typical grassland profiles on the northern slope of Tianshan Mountain, this paper analyzes the SIC distribution characteristics and influencing factors of grassland types and soil types in the vertical zone of the northern slope of Tianshan Mountain, which is of great significance to the study of carbon revenue and expenditure balance and carbon cycle mechanism in grassland ecosystem. The results showed that: (1) the average SIC contents of 1m soil layer, alpine meadow, warm mountain meadow, temperate meadow grassland, temperate desert steppe, temperate desert and lowland salinized meadow were 0.02, 7.72, 9.74, 8.5, 9.46, 7.38, 15.00 g kg-1, respectively. The inorganic carbon density (SICD) was 0.01, 7.98, 10.18, 7.13, 7.57, 6.80, 14.20 kg 路m -, respectively. The average SICD was 7.37 kg 路m-2, and the maximum coefficient of variation appeared in 0 脳 20 cm soil layer. There was no significant difference in SIC content and density in alpine meadow on soil profile, SIC content in warm mountain meadow increased at first and then decreased with the deepening of soil depth, while SICD increased gradually. SIC was mainly stored in 50 脳 100 cm, accounting for 64.84% of that in 0 脳 100 cm soil layer. The SIC content and density of the other six grasslands increased at first and then decreased with the deepening of soil depth, mainly distributed in the soil layer of 0 / 50 cm, accounting for 50.04 鈮，
本文编号：2506615
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