CAJ | 학술논문

对景电灌区土壤次生盐渍化的1年生枸杞地和多年生枸杞地、未盐渍化的小麦地和苜蓿地4种土地利用方式土壤有机碳和养分状况进行对比研究, 结果表明: 在0～60 cm土层, 小麦地土壤有机碳含量及其密度、全氮和速效磷含量均最高, 苜蓿地均最低; 土壤全氮与有机碳含量呈极显著正相关(r=0.791, P<0.01); 4种利用方式C/N比值均较低, 多年生枸杞地C/N比值最高, 1年生枸杞地最低; 4种利用方式速效钾含量无显著差异; 苜蓿地容重显著高于其他3种利用方式, 这与其低的有机碳含量密切相关(r=0.420, P<0.01).与小麦地相比, 1年生枸杞地土壤有机碳含量及其密度显著降低, 全氮和速效磷含量有所降低; 与1年生枸杞地相比, 多年生枸杞地土壤有机碳含量及其密度有所增加, 全氮含量显著降低, 速效磷含量显著增加.这意味着该区耕地土壤发生次生盐渍化以后, 土壤性状恶化; 种植枸杞使次生盐渍化土壤性状有所改善.
대경전관구토양차생염지화적1년생구기지화다년생구기지、미염지화적소맥지화목숙지4충토지이용방식토양유궤탄화양분상황진행대비연구, 결과표명: 재0～60 cm토층, 소맥지토양유궤탄함량급기밀도、전담화속효린함량균최고, 목숙지균최저; 토양전담여유궤탄함량정겁현저정상관(r=0.791, P<0.01); 4충이용방식C/N비치균교저, 다년생구기지C/N비치최고, 1년생구기지최저; 4충이용방식속효갑함량무현저차이; 목숙지용중현저고우기타3충이용방식, 저여기저적유궤탄함량밀절상관(r=0.420, P<0.01).여소맥지상비, 1년생구기지토양유궤탄함량급기밀도현저강저, 전담화속효린함량유소강저; 여1년생구기지상비, 다년생구기지토양유궤탄함량급기밀도유소증가, 전담함량현저강저, 속효린함량현저증가.저의미착해구경지토양발생차생염지화이후, 토양성상악화; 충식구기사차생염지화토양성상유소개선.
Soil organic carbon and nutrient contents were analyzed under four different land use patterns of annual medlar field (AMF) and perennial medlar field (PMD) in secondary saliferous soil, wheat field (WF) in un-saliferous soil and alfalfa field (AF) in wasteland in Jingdian Irrigation Zone. The analysis shows that organic carbon content and density, total nitrogen and Olsen phosphorus for WF are the highest, while those for AF are the lowest in the 0～60 cm soil layer. Soil total nitrogen has a significant positive correlation with organic carbon (r = 0.791, P < 0.01). There is a generally low C/N ratio for all the soil samples, that for PMD is highest and that for AMF is lowest. There is no significant difference in available potassium among the land use patterns. Soil bulk density is significantly higher for AF, due mainly to the relatively low soil organic carbon content (r = 0.420, P < 0.01). Soil organic carbon content and density are significantly lower while total nitrogen and Olsen phosphorus are higher under AMF relative to WF. Organic carbon content and density are also higher, total nitrogen content significantly lower and Olsen phosphorus content significantly higher under PMD in relation to AMF. An important finding of the study is that farmland soils deteriorate following secondary salinization whereas planting medlars improves soil physical and chemical properties in the study area.