The problems of spatial layout in livestock and poultry farms were discussed, and the development status of the planning evaluation on the spatial layout in recent years was systematically reviewed. The research progr...The problems of spatial layout in livestock and poultry farms were discussed, and the development status of the planning evaluation on the spatial layout in recent years was systematically reviewed. The research progress in planning evaluation systems and methods was mainly intro- duced. And some opinions were proposed to solve these problems.展开更多
文摘马缨丹(Lantana camara)是全球最具破坏力的100种入侵物种之一,目前已对我国南方部分地区生物多样性造成严重危害。为分析马缨丹在我国的潜在适生区,以全国479个马缨丹分布记录点、生物气候变量和地形因子为基础,采用最大熵(maximum entropy,Maxent)模型和地理信息系统(GIS)相结合进行预测。结果表明:(1)马缨丹适生区以秦岭-淮河线为界,主要分布在我国南方地区,广东、广西、香港、福建、海南和云南西南部属于马缨丹高度适生区,其面积占全国陆地面积的8.6%;浙江、江西、湖南、贵州、云南、四川和重庆等部分地区属于中度适生区,其面积占比为10.1%;低适生区和非适生区面积占比分别为27.8%和53.5%。在未来气候情景下,2040—2060年马缨丹总的适生区面积比1970—2000年增加1.6个百分点。(2)影响马缨丹分布的主要气候因子为最冷月份最低温度,其次为温度季节性变动系数和年均降水量。(3)采用受试者工作特征曲线(receiver operating characteristic curve,ROC曲线)计算曲线下面积(the area under ROC curve,AUC)平均值为0.953,标准差为0.006,表明Maxent模型对马缨丹适生区的预测结果可靠,马缨丹在我国的入侵扩散还未达到预测适生区的最大范围,仍有继续扩散的可能性。
基金funded by Natural Science Foundation of Beijing City (4102022)Science and Technology Project of Minjiang University (YKQ09003)
文摘The problems of spatial layout in livestock and poultry farms were discussed, and the development status of the planning evaluation on the spatial layout in recent years was systematically reviewed. The research progress in planning evaluation systems and methods was mainly intro- duced. And some opinions were proposed to solve these problems.
