摘要
在宁夏沙坡头南山台子扬黄灌溉绿洲选取草地、新耕地、老耕地、园地四种主要土地利用类型,通过采样分析其土壤理化性质特点,揭示开发过程、不同开发程度对当地土壤性质的影响。结果表明:(1)绿洲开发过程中,土壤p H呈降低趋势;随着灌溉时间的延长,土壤电导率逐渐下降。(2)草地被开发初期,土壤中养分含量出现不同程度的降低,以TN、TP、SOC下降最为显著(P<0.05);此后随着土地利用年限的延长,土壤养分含量有所增加且以园地变化最为显著(P<0.05)。(3)草地被开发后,土壤极细砂颗粒含量增加(P<0.05),随着土地利用年限延长土壤细黏粒含量增加,以开发为园地的增加最为显著(P<0.05)。(4)土壤细黏粒、粗黏粒与AN、TP、AP、SOC呈极显著正相关关系(P<0.01),与pH呈负相关关系(P<0.01);粉粒、极细砂与pH呈正相关关系(P<0.01),与其他因子呈负相关关系(P<0.01);细砂粒与pH呈正相关关系(P<0.01),与TN、TP为呈相关关系;粗砂粒只与SOC呈显著正相关关系(P<0.05)。(5)灌区土壤颗粒分形维数介于2.58~2.75之间,不同土地利用类型土壤颗粒分形维数大小依次为园地(2.75)>老耕地(2.73)>草地(2.70)>新耕地(2.58)。(6)土壤颗粒分形维数AN、TN、TP、AP、SOC呈正相关关系,与pH呈负相关关系;与土壤细黏粒、粗黏粒均呈对数正相关关系(R2=0.6214,N=105,P<0.01;R2=0.5824,N=105,P<0.01),与粉粒、细砂粒呈对数负相关关系(R2=0.1172,N=105,P<0.01),与极细砂呈线性负相关关系(R2=0.6352,N=105,P<0.01),与粗砂粒相关性不显著(N=105,P>0.05)。表明灌区长期土地开发利用能够有效改善土壤性质,促使土壤肥力提高、土壤颗粒细化。
Four main land use types of grassland, new cultivated land, old cultivated land and garden were selected as research plots. The soil physical and chemical properties were analyzed and the effects of different degrees of land development on soil properties were investigated in the Yanghuang Irrigation Oasis, Nanshantaizi, Shapotou, Ningxia.The result showed that:(1) During the development of oasis, the soil pH value tended to decrease, and the soil conductivity gradually was decreased with the irrigation time.(2) At the initial stage of grassland development, soil nutrient contents were decreased, especially total nitrogen(TN), total phosphorus(TP) and soil organic carbon(SOC).With the extension of land use years, soil nutrient contents were increased, especially in the garden(P < 0.05).(3) After grassland was developed, the content of soil extremely fine sand was increased(P < 0.05).With the extension of land use years, the content of soil fine clay was increased, especially in garden land(P < 0.05).(4) Fine clay and coarse clay were positively correlated(P < 0.01) with available nitrogen(AN), TP, available phosphorus(AP) and SOC and negatively correlated with p H(P < 0.01). There was a positive correlation(P < 0.01) between pH and silt and fine sand, and a negative correlation with other factors(P < 0.01). Fine sand was positively correlated with pH(P < 0.01),TN and TP. Coarse sand was only positively correlated with SOC(P < 0.05).(5) The fractal dimension of irrigated soil ranged from 2.58 to 2.75 and was at a good state. Among different land use types, the fractal dimension was decreased as follows: garden land(2.75) > old cultivated land(2.73) > grassland(2.70) > new cultivated land(2.58).(6) The fractal dimension of soil was positively correlated with AN, TN, TP, AP and SOC, and negatively correlated with pH.There was a logarithmically positive correlation between fractal dimension and fine clay(R2= 0.9188, P < 0.01) and coarse clay(R2= 0.85, P < 0.01). The fractal dimension presented a logarithmic negative
作者
苏芝屯
黄维
乔斌
何彤慧
冯艳琼
陈向全
崔乔
SU Zhi-tun;HUANG Wei;QIAO Bin;HE Tong-hui;FENG Yan-qiong;CHEN Xiang-qua;CUI Qiao(Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem,Ministry of Education,Ningxia University,Yinchuan 750021,China;Breeding Base of Key Laboratory for Preventing Land Degradation and Ecological Restoration,Ningxia University,Yinchuan 750021,China;Ningxia Hui Autonomous Region Forestry Investigation and Planning Institute,Yinchuan 750001,China;Key Laboratory of Disaster Prevention and Mitigation of Qinghai Province,Xining 810001,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2019年第5期1045-1052,共8页
Chinese Journal of Soil Science
基金
国家自然科学基金项目（41761102）
宁夏大学研究生创新项目（GIP2018079）
宁夏回族自治区环境保护科学技术研究项目（课题）任务书（2008-007）资助
关键词
土地开发
土壤理化性质
土壤粒径分布
扬黄灌区
Land development
Soil physical and chemical property
Soil particle size distribution
Yanghuang irrigation area
