摘要
【目的】研究新疆干旱荒漠绿洲区农田改建为果园或果农间作园后对土壤总有机碳、易氧化及溶解性有机碳的影响。【方法】在阿克苏地区采集小麦地、枣园及枣麦间作园土壤,测定其总有机碳、易氧化及溶解性有机碳含量。【结果】在0~100 cm土壤剖面上,不同土地利用方式下土壤总有机碳含量的平均值表现为枣园>枣麦间作>小麦,土壤易氧化及溶解性有机碳含量表现为枣麦间作>枣园>小麦。农田改建为果园或果农间作园后,显著提高了土壤总有机碳、易氧化及溶解性有机碳含量(P<0.05)。易氧化及溶解性有机碳的分配比例则表现为由农田更替为果园后,降低了各土层易氧化有机碳分配比例。农田更替为果农间作园后,降低了0~10 cm和10~20 cm土层的易氧化有机碳分配比例,其余土层表现为增加。溶解性有机碳分配比例大致随土层深度增加呈先减少后增加的变化趋势。不同土地利用方式下,农田、果园和果农间作园的土壤易氧化有机碳、溶解性有机碳含量均与土壤总有机碳含量显著正相关(P<0.05)。【结论】新疆干旱荒漠绿洲区农田转化为果园提高了土壤有机碳的稳定性,促进了土壤有机碳的积累,农田转化为果农间作园仅提高了表层0~20 cm土层有机碳的稳定性。
【Objective】To exolore the effects of the conversion of farmland to orchard or agroforestry on soil total organic carbon(TOC),liable organic carbon(LOC)and dissolved organic carbon(DOC)in typical arid desert oasis area.【Method】In Aksu area,the soils of wheat,jujube orchard and jujube-wheat intercropping were collected to determine the soil TOC,LOC and DOC content.【Result】In the 0-100 cm soil layer,the means of soil TOC content under different land use patterns were shown as follows:Jujube orchard>Jujube-wheat intercropping>wheat,while the soil LOC and DOC content were shown as follows:Jujube-wheat intercropping>Jujube orchard>wheat.After the conversion from farmland to jujube orchard or jujube-wheat intercropping,the soil TOC,LOC and DOC content were all increased significantly(P<0.05).The distribution ratios of LOC and DOC were shown as:The distribution ratio of LOC in each soil layer was reduced after the change from farmland to jujube orchard.After the conversion from farmland to jujube-wheat intercropping,the distribution ratio of LOC in the 0-10 cm and 10-20 cm soil layers were reduced,while the remaining soil layers were increased.However,the distribution ratio of DOC exhibit an initial decrease followed by an increase with an increase of the soil depth.Correlation analysis showed that the LOC and DOC content of the wheat,jujube orchard and jujube-wheat intercropping had a significant positive correlation with soil TOC content under different land use patterns(P<0.05).【Conclusion】It is found that the conversion of farmland to orchard improved the stability of soil organic carbon and promoted the accumulation of soil organic carbon,while the conversion from farmland to jujube-wheat intercropping only improved the stability of soil organic carbon in the 0-20 cm soil layer.
作者
王卫霞
阿丽娅·阿力木
杨光
王振锡
WANG Weixia;Aliya Alimu;YANG Guang;WANG Zhenxi(Key Laboratory of Forestry Ecology and Industry Technology in Arid Region, Education Department of Xinjiang/ College of Forestry and Horticulture, Xinjiang Agricultural University, Urumqi 830052, China)
出处
《新疆农业科学》
CAS
CSCD
北大核心
2022年第2期441-450,共10页
Xinjiang Agricultural Sciences
基金
国家自然科学基金“南疆盆地不同土地利用方式对土壤有机碳库的影响”(31760199)。
