Caragana microphylla is one of the key species for vegetation restoration in Horqin Sandy Land. Adopting field investigation and outdoor experiments,the microclimate effect of artificial C. microphylla communities wit...Caragana microphylla is one of the key species for vegetation restoration in Horqin Sandy Land. Adopting field investigation and outdoor experiments,the microclimate effect of artificial C. microphylla communities with different restoration years were studied by observing wind velocity,air temperature,relative humidity and soil temperature. The results show that:( 1) Caragana microphylla community has an obvious wind-breaking effect near ground surface. Compared with shifting dunes,the wind velocity in the 6-year-old and 11-year-old C. microphylla shrubs at the height of 30 cm separately decreases by 71. 9% and 76. 0%.( 2) Mean daily temperature in the 6-year-old and 11-yearold C. microphylla communities is 3. 7 ℃ and 4. 9 ℃ lower than in shifting dunes,respectively.( 3) The relative humidity of air in the Caragana microphylla shrubs is higher than in shifting dunes.( 4) Soil temperature in C. microphylla plantation is lower than in shifting dunes. These results are significant in further exploring material and energy exchange near surface layer of artificial vegetation in the extremely arid condition.展开更多
基金Supported by Project of National Natural Science Foundation(71203057,41271115,41071187)Young Scholar Project of Humanities and Social Science Foundation of Ministry of Education(11YJCZH056)Ph.D Foundation Project of Henan Polytechnic University(B2011-017)
文摘Caragana microphylla is one of the key species for vegetation restoration in Horqin Sandy Land. Adopting field investigation and outdoor experiments,the microclimate effect of artificial C. microphylla communities with different restoration years were studied by observing wind velocity,air temperature,relative humidity and soil temperature. The results show that:( 1) Caragana microphylla community has an obvious wind-breaking effect near ground surface. Compared with shifting dunes,the wind velocity in the 6-year-old and 11-year-old C. microphylla shrubs at the height of 30 cm separately decreases by 71. 9% and 76. 0%.( 2) Mean daily temperature in the 6-year-old and 11-yearold C. microphylla communities is 3. 7 ℃ and 4. 9 ℃ lower than in shifting dunes,respectively.( 3) The relative humidity of air in the Caragana microphylla shrubs is higher than in shifting dunes.( 4) Soil temperature in C. microphylla plantation is lower than in shifting dunes. These results are significant in further exploring material and energy exchange near surface layer of artificial vegetation in the extremely arid condition.
文摘通过对柑橘园内套种的黑麦草（Lolium perenne），藿香蓟（Ageratum conyzoides），香矢车菊（Centaurtea cya-nns），柠檬罗勒（ Ocimum americannm），菊苣（ Cichorium intybus ）及对照（裸地）小气候的观测，分析了气温、空气相对湿度、土壤温度和土壤含水率的日变化规律，旨在研究不同植草栽培对柑橘园小气候的影响，以期为优化柑橘园种植模式提供理论依据。结果表明：不同植草处理较对照可降低日平均气温0．5℃～1．2℃，各种草最大降温幅度的高度层依次为柠檬罗勒（20 cm ）、藿香蓟（50 cm ）、黑麦草（150 cm ）、菊苣（150 cm ）、香矢车菊（150 cm）；不同植草处理较对照可降低日平均土壤温度1．7℃～3．7℃，各种草均在15 cm深度层降温幅度最大；不同植草栽培较裸地可以提高日平均空气相对湿度3．3％～6．5％；不同深度日平均土壤含水率提高1．2％～3．5％；各土层土温和土壤含水率呈显著性负相关，随着土层深度的增加，相关系数减小。菊苣降低气温效果最好，柠檬罗勒增加空气湿度效果最好，黑麦草降低土温和增加土壤含水率效果最明显。
