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安徽省旱园地土壤资源特点与利用改良途径
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作者 钱国平 刘政群 +1 位作者 罗嗣金 杨厚国 《安徽农学通报》 1996年第4期3-4,共2页
本文论述了安徽省旱园地土壤资源概况和利用特点,并根据旱地土壤资源的农业发展受水资源因素制约,土壤肥力不高,中低产田面积大的特点,提出了其利用改良途径.
关键词 旱园地 土壤资源 利用改良
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南方利用冬闲田种植黑麦草前景广阔 被引量:1
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作者 张育英 庄国洪 《饲料工业》 北大核心 1995年第10期1-2,共2页
南方利用冬闲田种植黑麦草前景广阔广东省揭西县畜牧局张育英,庄国洪黑麦草是一种优质、高产的禾本科牧草,广东揭西县从1992年冬引进在县畜禽品改站和河婆樟树坑试种成功后,1993年冬继续在全县7个乡镇进行大面积示范,种植... 南方利用冬闲田种植黑麦草前景广阔广东省揭西县畜牧局张育英,庄国洪黑麦草是一种优质、高产的禾本科牧草,广东揭西县从1992年冬引进在县畜禽品改站和河婆樟树坑试种成功后,1993年冬继续在全县7个乡镇进行大面积示范,种植面积108亩,并利用黑麦草养猪、养... 展开更多
关键词 黑麦草 冬闲田 旱园地 蛋白质含量 揭西县 前景广阔 青饲 经济效益和社会效益 水稻收割 土壤有机质
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Above-ground Biomass Allocation in a Planted Forest in a Semi-arid Region of Northern Mongolia
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作者 Sukhbaatar Gerelbaatar Nachin Baatarbileg 《Journal of Agricultural Science and Technology(B)》 2013年第3期216-220,共5页
Investigation of the above-ground biomass allocation patterns on Scots pine plantations is critical for quantifying the productivity and carbon cycle of forest ecosystems. We estimated above-ground biomass and net pri... Investigation of the above-ground biomass allocation patterns on Scots pine plantations is critical for quantifying the productivity and carbon cycle of forest ecosystems. We estimated above-ground biomass and net primary production of a 25-year-old Pinus sylvestris L. (Scots pine) plantation, in a semi-arid region of Mongolia. The above-ground biomass of sample trees was divided into stem wood, stem bark, live branches, dead branches and needles. Total biomass for the stand was only 18.03 Mg ha1, of which 47.6% was found in stem wood, 25.8% in live branches and 14.8% in needles. The growth rate of the Scots pine plantation in the study region was relatively low compared with other regions. In the study area, it was observed that the rate of biomass accumulation in the plantation was very slow; this can be explained by very limited growing conditions and intensive crown closure. The results from this study indicate that it may be necessary to carry out thinning to increase biomass production by reducing competition between trees in the Scotch pine plantation. 展开更多
关键词 Biomass allocation dry biomass Scots pine plantation PRODUCTIVITY forest ecosystems.
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Surface Soil Properties Influence Carbon Oxide Pulses After Precipitation Events in a Semiarid Vineyard Under Conventional Tillage and Cover Crops 被引量:1
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作者 Fernando PEREGRINA 《Pedosphere》 SCIE CAS CSCD 2016年第4期499-509,共11页
In semiarid regions of the Mediterranean basin, a rainfall event can induce a respiratory pulse that releases a large amount of soil carbon dioxide (CO2) into the atmosphere; this pulse can significantly contribute ... In semiarid regions of the Mediterranean basin, a rainfall event can induce a respiratory pulse that releases a large amount of soil carbon dioxide (CO2) into the atmosphere; this pulse can significantly contribute to the annual ecosystem carbon (C) balance. The impacts of conventional tillage and two different cover crops, resident vegetation and Bromus catharticus L., on soil CO2 effiux were evaluated in a Vitis vinifera L. vineyard in La Rioja, Spain. Soil CO2 efflux, gravimetric water content, and temperature were monitored at a depth of 0-5 cm after rainfall precipitation events approximately every 10 d in the period from May 17 to July 27, 2012, during which the cover crops had withered. Additionally, on June 10, 2012, soil organic C, microbial biomass C, and I^-glucosidase activity were determined at soil depths of 0-2.5, 2.5-5, 5-15, and 15-25 cm. The results show that pulses of soil CO2 were related to the increase in soil water content following precipitation events. Compared to the conventional tillage treatment, both cover crop treatments had higher soil CO2 efflux after precipitation events. Both cover crop treatments had higher soil organic C, microbial biomass C, and β-glucosidase activity at the soil surface (0-2.5 cm) than the conventional tillage treatment. Each pulse of CO2 was related to the surface soil properties. Thus, this study suggests that the enhancement of soil organic C and microbiological properties at the soil surface under cover crops may increase soil CO2 efflux relative to conventional tillage immediately after precipitation events during the dry season. 展开更多
关键词 microbial biomass C β-glucosidase activity soil CO2 effiux soil water content soil temperature
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