农业科学与技术（英文版）
農業科學與技術（英文版）
농업과학여기술（영문판）
AGRICULTURAL SCIENCE & TECHNOLOGY
2015年
5期
1014-1018
,共5页
郭春秀%王理德%韩福贵%马剑平%何芳兰%刘淑娟%王方琳%张莹花%魏林源
郭春秀%王理德%韓福貴%馬劍平%何芳蘭%劉淑娟%王方琳%張瑩花%魏林源
곽춘수%왕리덕%한복귀%마검평%하방란%류숙연%왕방림%장형화%위림원
民勤绿洲%退耕地%退耕年限%土壤物理性质
民勤綠洲%退耕地%退耕年限%土壤物理性質
민근록주%퇴경지%퇴경년한%토양물이성질
Minqin Oasis%Abandoned land%Abandoned years%Soil physical properties
石羊河下游因水资源减少而退耕大面积土地，测试其物理性质，旨在为管理提供依据。选择不同退耕时期（1年、2年、3年、4年、5年、8年、15年、24年和31年）土地，分层采集0~40 cm范围内土样，分析其容重、孔隙度和机械组成。结果表明：随着退耕年限增加，土壤粘粒呈减少趋势，粉粒增加，退耕4年达到最大，之后则略有增减；土壤垂直剖面的土壤粒度分异性增大，而变化最大的土层为0~10 cm。退耕土壤容重随着退耕时间延长而增加，退耕3年之后的不同深度的土壤容重及孔隙度的差异变小。随着退耕年限增加，土壤质地变粗，通透性增加，土壤质量下降。退耕3~4年期间的土壤物理性质相对变化明显，是退耕地管理的关键时期。
石羊河下遊因水資源減少而退耕大麵積土地，測試其物理性質，旨在為管理提供依據。選擇不同退耕時期（1年、2年、3年、4年、5年、8年、15年、24年和31年）土地，分層採集0~40 cm範圍內土樣，分析其容重、孔隙度和機械組成。結果錶明：隨著退耕年限增加，土壤粘粒呈減少趨勢，粉粒增加，退耕4年達到最大，之後則略有增減；土壤垂直剖麵的土壤粒度分異性增大，而變化最大的土層為0~10 cm。退耕土壤容重隨著退耕時間延長而增加，退耕3年之後的不同深度的土壤容重及孔隙度的差異變小。隨著退耕年限增加，土壤質地變粗，通透性增加，土壤質量下降。退耕3~4年期間的土壤物理性質相對變化明顯，是退耕地管理的關鍵時期。
석양하하유인수자원감소이퇴경대면적토지，측시기물이성질，지재위관리제공의거。선택불동퇴경시기（1년、2년、3년、4년、5년、8년、15년、24년화31년）토지，분층채집0~40 cm범위내토양，분석기용중、공극도화궤계조성。결과표명：수착퇴경년한증가，토양점립정감소추세，분립증가，퇴경4년체도최대，지후칙략유증감；토양수직부면적토양립도분이성증대，이변화최대적토층위0~10 cm。퇴경토양용중수착퇴경시간연장이증가，퇴경3년지후적불동심도적토양용중급공극도적차이변소。수착퇴경년한증가，토양질지변조，통투성증가，토양질량하강。퇴경3~4년기간적토양물이성질상대변화명현，시퇴경지관리적관건시기。
The vast area of farmland was abandoned at downstream of the Shiyang River because of decreased water recourse. To ensure the ecological safety of Minqin Oasis and to provide management basis for the abandoned land, soil physi-cal properties were observed and studied. The authors analyzed land with abandon-ment time of 1 year, 2 years, 3 years, 4 years, 5 years, 8 years, 15 years, 24 years and 31 years. Samples were took at the 0-40 cm layer of soil to measure the bulk density, porosity and grain composition of soil in the different abandoned lands. Results showed that the tendency of clay content was decreasing, converse-ly, the fine sand increased at the layer of 0-10 cm of different abandoned lands. The changes of grain content reached a peak at the fourth year after the land was abandoned, then varied slightly. The variation of grain content of abandoned land was obvious with the extension of the abandonment year. The soil bulk density de-creased and porosity increased with the extension of the abandonment year. The difference of porosity and soil bulk density at the range of 0-40 cm of different aban-doned land decreased after the land abandoned for 3 years. The quality of soil was decreased, while the soil permeability was improved. The soil physical properties changed obviously in 3 to 4 years after abandonment, so it is the key time for land management.
