根据塔里木盆地绿洲区三处试验点棉花耐盐试验观测资料,应用spss for windows统计软件进行分析,建立了两种形式的棉花耐盐函数:线性分段式和非线性-S型。通过对它们进行分析比较,得出型函数及由其推得的棉花耐盐阈值更符合该地区产量-...根据塔里木盆地绿洲区三处试验点棉花耐盐试验观测资料,应用spss for windows统计软件进行分析,建立了两种形式的棉花耐盐函数:线性分段式和非线性-S型。通过对它们进行分析比较,得出型函数及由其推得的棉花耐盐阈值更符合该地区产量-土壤盐分的响应关系。展开更多
The EC analysis and water serial sampling was performed in the Tarim Desert Highway shelterbelt to explore the water and salt dynamics of the shallow aeolian sandy soil ( 0-30cm) under high salinity groundwater drip i...The EC analysis and water serial sampling was performed in the Tarim Desert Highway shelterbelt to explore the water and salt dynamics of the shallow aeolian sandy soil ( 0-30cm) under high salinity groundwater drip irrigation. It was found that in one irrigation cycle, the EC of the shallow shifting aeolian sandy soil ( 0-30cm) increased while the water content decreased. The EC of the surface aeolian sandy soil at the wetting front was far greater than that of the wetting area or the outside of the wetting area. During the irrigation cycle, the EC of the wetting front and the wetting area changed at a significant magnitude, whereas the EC of the outside of the wetting area remained largely steady. The horizontal influence distance of drip irrigation on the salt accumulation at the soil surface was about 100 cm, and the vertical influence depth was 5 cm. The three most abundant ions in the accumulated salt at the aeolian sandy soil surface were Na+, Cl- and SO42-. The salt accumulation at the soil surface was influenced by air temperature, wind speed, mineralization of irrigation water, sand burial thickness, soil texture, and litter content.展开更多
通过田间小区试验和微区试验相结合研究滴灌条件下不同灌溉水盐度、灌水量和施氮量对棉田土壤中氮肥去向的影响。试验设置3种灌溉水盐度(电导率,EC):0.35、4.61和8.04 d S m-1(分别以S0.35、S4.61和S8.04表示);2个灌水量:405和540 mm;...通过田间小区试验和微区试验相结合研究滴灌条件下不同灌溉水盐度、灌水量和施氮量对棉田土壤中氮肥去向的影响。试验设置3种灌溉水盐度(电导率,EC):0.35、4.61和8.04 d S m-1(分别以S0.35、S4.61和S8.04表示);2个灌水量:405和540 mm;同时设置2个施氮水平:240、360 kg hm-2(360 kg hm-2为当地棉田推荐氮肥用量)。结果表明:S0.35和S4.61灌溉处理的棉花氮素吸收量和产量无显著差异,分别较S8.04灌溉处理高出27.46%和33.65%、21.29%和21.63%。灌溉水盐度主要通过影响棉花单株结铃数来影响棉花产量。增加施氮量和灌水量,棉花氮素吸收量和产量均有所增加。15N同位素标记试验结果表明:植物15N回收率在34.20%~62.51%之间,随灌溉水盐度的增加,植物15N回收率呈现先增加后减小的趋势,S0.35、S4.61处理较S8.04处理分别高出30.70%和41.77%;增加灌水量和施氮量可显著提高植物15N回收率。土壤15N残留率随灌溉水盐度的增加而增加,S4.61和S8.04处理的土壤15N残留率较S0.35处理分别高出3.48%和23.22%。施氮量由240 kg hm-2增加至360 kg hm-2,土壤15N残留率增加9.51%。各处理15N淋洗损失率在0.35%~3.59%之间,低施氮量下,S0.35和S4.61处理的15N淋洗损失率无显著差异,S8.04处理的15N淋洗损失率分别较S0.35、S4.61处理高出1.87倍和0.84倍;高施氮量下,15N淋洗损失率随灌溉水盐度的增加而显著增加。增加灌水量和施氮量,15N淋洗损失率均显著增加。展开更多
基金Supported by Major Orientation Foundation of the CAS Innovation Program (Grant No. KZCX3-SW-342)CAS Action-Plan for West Development (Grant No. KZCX2-XB2-13)+3 种基金Major Scientific and Technological Special of Xinjiang Uygur Autonomous Region (Grant No. 200733144-3)National Natural Science Foundation of China (Grant No. 40701098)the research projects of the Tarim Branch of Petro-China Company Limited (Grant Nos. 971008090016 and 971008090017)CAS Xinjiang Institute of Ecology and Geography "Dr. Talent" Project of Oasis Scholars Training Plan
文摘The EC analysis and water serial sampling was performed in the Tarim Desert Highway shelterbelt to explore the water and salt dynamics of the shallow aeolian sandy soil ( 0-30cm) under high salinity groundwater drip irrigation. It was found that in one irrigation cycle, the EC of the shallow shifting aeolian sandy soil ( 0-30cm) increased while the water content decreased. The EC of the surface aeolian sandy soil at the wetting front was far greater than that of the wetting area or the outside of the wetting area. During the irrigation cycle, the EC of the wetting front and the wetting area changed at a significant magnitude, whereas the EC of the outside of the wetting area remained largely steady. The horizontal influence distance of drip irrigation on the salt accumulation at the soil surface was about 100 cm, and the vertical influence depth was 5 cm. The three most abundant ions in the accumulated salt at the aeolian sandy soil surface were Na+, Cl- and SO42-. The salt accumulation at the soil surface was influenced by air temperature, wind speed, mineralization of irrigation water, sand burial thickness, soil texture, and litter content.
文摘通过田间小区试验和微区试验相结合研究滴灌条件下不同灌溉水盐度、灌水量和施氮量对棉田土壤中氮肥去向的影响。试验设置3种灌溉水盐度(电导率,EC):0.35、4.61和8.04 d S m-1(分别以S0.35、S4.61和S8.04表示);2个灌水量:405和540 mm;同时设置2个施氮水平:240、360 kg hm-2(360 kg hm-2为当地棉田推荐氮肥用量)。结果表明:S0.35和S4.61灌溉处理的棉花氮素吸收量和产量无显著差异,分别较S8.04灌溉处理高出27.46%和33.65%、21.29%和21.63%。灌溉水盐度主要通过影响棉花单株结铃数来影响棉花产量。增加施氮量和灌水量,棉花氮素吸收量和产量均有所增加。15N同位素标记试验结果表明:植物15N回收率在34.20%~62.51%之间,随灌溉水盐度的增加,植物15N回收率呈现先增加后减小的趋势,S0.35、S4.61处理较S8.04处理分别高出30.70%和41.77%;增加灌水量和施氮量可显著提高植物15N回收率。土壤15N残留率随灌溉水盐度的增加而增加,S4.61和S8.04处理的土壤15N残留率较S0.35处理分别高出3.48%和23.22%。施氮量由240 kg hm-2增加至360 kg hm-2,土壤15N残留率增加9.51%。各处理15N淋洗损失率在0.35%~3.59%之间,低施氮量下,S0.35和S4.61处理的15N淋洗损失率无显著差异,S8.04处理的15N淋洗损失率分别较S0.35、S4.61处理高出1.87倍和0.84倍;高施氮量下,15N淋洗损失率随灌溉水盐度的增加而显著增加。增加灌水量和施氮量,15N淋洗损失率均显著增加。
