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基于GIS的陕南柑桔气候生态适宜性区划 被引量:19
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作者 朱琳 李星敏 +2 位作者 朱延年 贺文丽 柏秦凤 《中国农业气象》 CSCD 2011年第1期122-128,共7页
陕南秦巴山区地处北亚热带气候区,是柑桔种植北缘地带。为了科学、合理地利用当地农业气候资源,进一步优化产业结构,达到趋利避害、防灾减灾的目的,本文根据陕南秦巴山区近30a的气候资料,采用极端最低气温多年平均值、1月平均气温、年... 陕南秦巴山区地处北亚热带气候区,是柑桔种植北缘地带。为了科学、合理地利用当地农业气候资源,进一步优化产业结构,达到趋利避害、防灾减灾的目的,本文根据陕南秦巴山区近30a的气候资料,采用极端最低气温多年平均值、1月平均气温、年平均气温及年降水量4个因子作为陕南柑桔气候适宜性区划指标;利用GIS空间分析及制图功能,在实现区划指标空间化基础上,采用模糊综合评判方法,对陕南秦巴山区柑桔气候适宜性进行区划,并对各适宜区柑桔生长气候条件优劣进行评述。结果表明,陕南柑桔气候适宜区主要分布于秦巴山区海拔700m以下的浅山丘陵区,在适宜区内,应根据地形特征,选择冷空气不易堆积的"难进易出型"丘陵坡地栽培,以减少冻害。 展开更多
关键词 柑桔 农业气候 地理信息系统 区划
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Agrobiodiversity for Livelihood Security: A Case Study of Agroforestry Technologies in Mexico
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作者 P. Krishna Krishnamurthy Krishnamurthy Laksmi Reddiar 《Journal of Life Sciences》 2011年第2期108-119,共12页
The present article examines the livelihood benefits associated with agrobiodiversity in Veracruz, Mexico. Citrus-based agriculture is the principal economic activity in the agricultural sector of the state of Veracru... The present article examines the livelihood benefits associated with agrobiodiversity in Veracruz, Mexico. Citrus-based agriculture is the principal economic activity in the agricultural sector of the state of Veracruz. It is practiced in mono-crop plantations by the majority of farmers, who are rendered vulnerable to price depreciation resulting from simultaneous harvest and over-supply of a single commodity. Some farmers have associated multiple crops in citrus farms (agroforestry techniques) as a strategy to improve their livelihoods. Farmers who increased agrobiodiversity in their farms have significantly improved their livelihoods compared to mono-crop plantation owners. The research shows that increased agro-biodiversity can be a strategy to improve the livelihoods of citrus producers in the state of Veracruz, with significant economic benefits depending on the crop combination: maize-citrus is the least economically profitable combination (providing 21% in terms of internal rate of return), while pineapple-citrus, banana-citrus and vanilla-citrus give higher returns (41%, 44% and 221% respectively). The citrus-vanilla crop combination also has the highest benefit-cost ratio, relative to citrus monocrop (1.91) as well as the highest net present value (MX$579,635.73). The choice of crop ultimately depends on the farmer's priorities. The associated benefits can be classified in three ways which correspond to the tripartite goal of sustainable development: (i) ecological sustainability (through increased ecosystem resilience), (ii) economic stability (through diversified, less risk-prone sources of income), and (iii) social well-being (through lower). 展开更多
关键词 AGROBIODIVERSITY agrofroestry citriculture livelihood security Mexico multiple cropping.
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