| 摘要: |
| 以塔里木盆地北缘典型绿洲阿拉尔垦区为靶区，结合经典统计学和冗余分析技术，研究绿洲7种土地利用类型土壤有机碳、无机碳含量与土壤理化因子的分异规律及相关性。统计分析显示，研究区不同土地利用类型土壤有机碳、无机碳含量在各土层具有不同的分布格局，相同土层不同类型间的分布存在一定差异。0~20、20~50和50~80 cm土层有机碳含量均值分别为6.97、2.95和2.45 g/kg，无机碳含量为4.83、5.25和3.48 g/kg；在0~20 cm土层中，有机碳含量以天然林最高、沙地最低，无机碳表现为棉田、盐碱地、荒草地、沙地含量显著高于其他3种类型；20~50 cm土层中，有机碳含量最高值出现在天然林、人工林中，且显著高于荒草地和沙地，无机碳分布与0~20 cm土层保持一致；50~80 cm土层中，果园、棉田有机碳含量显著高于沙地，各类型无机碳含量差异不显著。冗余分析结果表明：土壤有机碳含量与全氮、土壤含水量呈极显著正相关（P<0.01），与容重极显著负相关（P<0.01），无机碳含量与全盐呈极显著正相关（P<0.01），与全氮、土壤含水量、速效钾呈极显著负相关（P<0.01），pH、有效磷则与土壤有机碳和无机碳含量的相关性均未达显著水平（P>0.05）；各理化因子对土壤有机碳、无机碳含量影响的重要性排序为：全氮 > 容重 > 土壤含水量 > 有效磷 > 速效钾 > 全盐 > pH。 |
| 关键词: 土壤有机碳 土壤无机碳 不同土地利用类型 冗余分析 塔里木盆地北缘 |
| DOI：10.11841/j.issn.1007-4333.2017.12.10 |
| 投稿时间：2016-12-19 |
| 基金项目:自治区青年科技创新人才培养工程（qn2015yx002）；国家自然科学基金项目（41461105） |
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| Changes in SOC and SIC concentration with land uses and their soil influencing factors in northern marginal zones of Tarim Basin |
|
GONG Lu, LUO Yan, XIE Lina
|
| (College of Resources and Environmental Science/Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China) |
| Abstract: |
| Organic/inorganic carbon contents and physical-chemical factors in oasis soil,and the correlations between them were analyzed by traditional statistics and redundancy analysis in the northern marginal zones of Tarim Basin.The results showed that the soil organic and inorganic carbon content in different land use types of soil had different distribution pattern.In 0-20,20-50 and 50-80 cm soil layers the average of soil carbon properties (soil organic and soil inorganic carbon) were 6.97,2.95,2.45 g/kg and 4.83,5.25,3.48 g/kg,respectively.In 0-20 cm soil layer,the content of soil organic carbon was highest under natural forest,lowest under sand,the soil inorganic carbon under cotton fields,saline-alkali land,weeds land were similar and much higher than other three types;In 20-50 cm soil layer,the content of organic carbon under natural forests and plantation were reached highest and significantly higher than weeds and sand,the distribution of the inorganic carbon was in line with 0-20 cm soil layer;In 50-80 cm soil layer,the content of organic carbon under orchard and cotton fields is significantly higher than sand,the content of inorganic carbon under different types was not significant in this soil layer.According to the RDA results,the total nitrogen,soil moisture and total salt were significantly positive correlated with soil organic carbon content (P<0.01),and bulk density was significant negative correlated with it (P<0.01).The total salt was significantly positive correlated with soil inorganic carbon content (P<0.01),and the total nitrogen,soil moisture,available potassium were significantly negative correlated with soil inorganic carbon content (P<0.01).There was no significant correlationsbetween pH/available P and the content of soil carbon (P>0.05);The importance of environmental factors to soil carbon content in descending order was nitrogen > bulk density > soil moisture > available P > available K > total salt > pH. |
| Key words: soil organic carbon soil inorganic carbon different land use types redundancy analysis the northern marginal zones of Tarim Basin |
