京津地区近50年来水稻播种面积变化及其对降水变化的响应研究   总被引：5，自引：1，他引：4  

苏桂武  方修琦 《地理科学》2000,20(3):212-217

基于滑动－ｔ突变检验结果,对京津两地近５０年来水稻种植面积的变化进行了阶段划分,并分别讨论了各阶段的变化特点。两地水稻种植面积的阶段性均受自然、技术和政策等多方面因素的综合影响。事件相关分析发现,作为人类对隆水变化响应的裟种植面积的变化较降水变化滞后一年,使得年雨量变化与当年水稻种植面积变化之间存在在明显的负相关。  相似文献   

（三）贵州省南药种植气候风险区划     

杨恕良  莫建国 《贵州气象》2000,24(3):10-11

1　引言南药系指原产于热带国家的药材 ,在我国南方等省也有种植 ,经过多年的引种栽培 ,野生变家种。在我省南部边缘的低热河谷有少量种植和生长 ,截至目前为止 ,我省种植和生产的南药有砂仁、儿茶、安息香、苏木、肉桂、巴戟、八角、木瓜、艾纳香、龙眼肉、荔枝核等十余种。分布在罗甸、望谟、册亨、兴义、紫云、安龙、贞丰、关岭、赤水、习水等县 ,并初步具有一定的商品基地规模。由于南药对疾病有奇特的疗效 ,一些南药同时又可作为食用香料以及制造高级化妆品的主要原料 ,因而经济价值非常高。然而南药对热量条件的要求特别严格 ,如遇霜…  相似文献   

模糊聚类分析在粤西芒果炭疽病流行区域划分上的应用     

冯荣扬 《广东海洋大学学报》2000,20(1):52-55

根据粤西６个市（县）种植的３个主要芒果品种芒果炭疽病（Ｇｌｏｅｏｓｐｏｒｉｕｍ ｍａｎｇｉｆｅｒａｅ Ｐ．Ｈｅｎｎ．ｅｔ ａｌ）病情指数,应用模糊聚类分析方法,划选出粤西种植芒果的适宜区域,并指出干旱地区不利不该病发生。  相似文献   

镉米之痛     

刘焕启 《地球》2013,(6)

正"民以食为天,国以粮为本。"我国有7000年有水稻种植历史,是世界上水稻品种最早有文字记录的国家。在我国南方,大米一直是长江流域及其以南地区人民的主粮。然而,就是这种每天饭桌必不可少的主食,最近却被曝出安全隐忧,被推到舆论的风头浪尖。5月16日,广州市食品药品监管  相似文献   

探究性学习训练     

鲁爱华  朱爱华  李新运 《地理教学》2013,(1):46-48

正~~  相似文献   

中国南方调整水稻种植格局——一种水稻生产预先适应气候变化的选择(英文)   总被引：1，自引：0，他引：1  

马欣  吴绍洪  李玉娥  张雪艳  高清竹  伍洋 《地理学报(英文版)》2013,23(1):67-84

Rice planted in southern China accounts for 94% of the total in sown acreage and 88% of the total in production, which matters a lot to Chinese food security. However, due to the prolonged conflict between water availability and rice growth in spatial/temporal distribu-tion, rice production suffers from seasonal drought at acreage of 16%-22%, which compro-mises food production capacity and food security. Focusing on the spatial distribution of seasonal drought with rice and the practices to adapt to it, and based on an analysis of bal-anced water supply for and demand by rice at a growing season scale during 1981-2030, this paper assesses the changing seasonal drought in the process of rice production under the changing climate in the future, and identifies general rice re-cultivation options for climate change adaptation. Some conclusions can be drawn as follows. (1) Rice suggests a decline in seasonal drought, with early season rice (early rice hereafter) by 12,500 km2, middle season rice (middle rice) by 80,000 km2, and in particular late season rice (late rice) by 25,000 km2, which accounts for almost 20% of its cultivated acreage. It is indicated that due to climate change, seasonal drought in major rice producing areas tends to alleviate in general, late season rice in particular. (2) Future climate change brings about a significant impact on the spatial/temporal distribution of water resources in rice producing areas in China. Based on ’pre-designed’ adaptation actions for rice-re-cultivation, the rice cultivation pattern undergoes a significant alteration between 1981-2000 and 2001-2030. In eastern Guizhou and western Hunan, the pattern of single early plus single dry farming is changed into double cropping. In eastern Hunan, the pattern of dry cropping is changed into single early plus single dry farming. In northern Anhui, the pattern of dry farming cropping is changed into middle rice. All this is aimed at a potential adequate availability of water for rice production in the future. (3) Rice re-cultivation patterns developed in this paper help re-balance water demand and supply for rice growth using the spatial analysis tool to adapt rice growth to the changing water avail-ability from spatial perspective, and come up with rice producer-friendly re-cultivation options in response to climate change.  相似文献   

Change analysis of rice area and production in China during the past three decades   总被引：7，自引：3，他引：4  

Zhenhuan Liu  Zhengguo Li  Pengqin Tang  Zhipeng Li  Wenbin Wu  Peng Yang  Liangzhi You  Huajun Tang 《地理学报(英文版)》2013,23(6):1005-1018

Rice＇s spatial-temporal distributions, which are critical for agricultural, environ- mental and food security research, are affected by natural conditions as well as socio-eco- nomic developments. Based on multi-source data, an effective model named the Spatial Production Allocation Model （SPAM） which integrates arable land distribution, administrative unit statistics of crop data, agricultural irrigation data and crop suitability data, was used to get a series of spatial distributions of rice area and production with 10-km pixels at a national scale -it was applied from the early 1980s onwards and used to analyze the pattern of spatial and temporal changes. The results show that significant changes occurred in rice in China during 1980-2010. Overall, more than 50% of the rice area decreased, while nearly 70% of rice production increased in the change region during 1980-2010. Spatially, most of the increased area and production were in Northeast China, especially, in Jilin and Heilongjiang; most of the decreased area and production were located in Southeast China, especially, in regions of rapidly urbanization in Guangdong, Fujian and Zhejiang. Thus, the centroid of rice area was moved northeast approximately 230 km since 1980, and rice production about 320 km, which means rice production moved northeastward faster than rice area because of the significant rice yield increase in Northeast China. The results also show that rice area change had a decisive impact on rice production change. About 54.5% of the increase in rice pro- duction is due to the expansion of sown area, while around 83.2% of the decrease in rice production is due to contraction of rice area. This implies that rice production increase may be due to area expansion and other non-area factors, but reduced rice production could largely be attributed to rice area decrease.  相似文献   

基于面向对象的山东省冬小麦种植面积监测          下载免费PDF全文

薛卫宁 《山东国土资源》2014,30(5)

利用遥感技术,使用eCognition软件的面向对象分类技术,对RAPIDEYE卫星影像进行分类识别,从而快速、准确的监测小麦种植面积,为冬小麦财政补贴提供数据和技术支持。以兖州市为例,行政区面积6.501 9万hm2,小麦监测面积3.1715万hm2,小麦面积监测精度达到了90.5%。  相似文献   

污泥丙烯酸吸水树脂性能试验及在榆林矿区植被恢复中的应用     

聂兴信  付小艳  程平  孙锋刚 《地质灾害与环境保护》2022,33(1):114-120

水资源是影响榆林废弃矿区植被恢复的关键因素,污泥丙烯酸吸水树脂的保水特性有利于矿区植被恢复.通过试验方法研究污泥丙烯酸吸水树脂的性能及其对植物栽植的土壤含水率、植物株高、植物成活率的影响规律,并采用内梅罗指数法对复垦土壤进行质量评价.结果表明:污泥丙烯酸吸水树脂最大的吸水倍率为763.4 g/g;添加保水剂后土壤含水率...  相似文献   

农业种植规模与降水量变化对农用地下水开采量影响识别   总被引：1，自引：0，他引：1  

刘中培  于福荣  焦建伟 《地球科学进展》2012,27(2):240-245

以石家庄平原区作为研究区域,运用相关分析及回归分析阐明农用地下水开采量与降水量及小麦—玉米种植规模之间的关系。降水量与农用地下水开采量之间的相关系数较小,但作为农作物需水的重要水源,降水量通过影响农业地下水开采强度影响地下水开采总量。农业地下水开采强度在丰水年时明显减小,在枯水年时明显增大。小麦和玉米作为主要的耗水型作物,其种植面积与农用地下水开采量关系密切,随小麦—玉米种植面积的增加(减小),农用地下水开采量表现出明显的增加(减小)趋势。1981年之前,小麦—玉米种植面积每增加1×104 hm2,农用地下水开采量平均增加0.69×108 m3;1981年之后,小麦—玉米种植面积每增加1×104 hm2,农用地下水开采量增加0.23×108 m3。  相似文献