陇东黄土高原春播紫花苜蓿生长规律及气候生产潜力评估  

Growth disciplinarian of alfalfa sowed in spring and evaluation of climate productivity in the loess plateau of East Gansu

作　　者：王位泰[1,2] 张天锋 黄斌 杨民[3] 蒲金涌[4] 车向军 

机构地区：[1]甘肃省干旱气候变化与减灾重点实验室,中国气象局兰州干旱气象研究所,甘肃兰州730020 [2]庆阳市气象局,甘肃西峰745000 [3]甘肃省气象局,甘肃兰州730020 [4]天水农业气象试验站,甘肃天水741020 [5]庆城县气象局,甘肃合水745400

出　　处：《干旱地区农业研究》2007年第5期214-219,共6页Agricultural Research in the Arid Areas

基　　金：科技部社会公益项目(2004DIB5J192)"中国干旱气象灾害监测预警方法研究"课题;中国气象局气象科技扶贫项目"紫花苜蓿(金皇后)引种试验;示范;推广"课题;兰州区域气象中心开放实验室项目"庆阳紫花苜蓿生态观测及气候;土壤对陇东草产业生产影响研究"专题(Lab2002-4)

摘　　要：利用春播两年生紫花苜蓿生长状况和平行气候条件观测资料，分析陇东黄土高原地区紫花苜蓿的生长高度和速率的时间变化规律，干物重和鲜草重与活动积温的相关关系；根据牧草气候生产力的光合产量和温度及降水订正模型，计算紫花苜蓿的气候生产潜力。结果表明：春播当年的开花～枯黄，第二年的显蕾～开花期的生长高度增长量达最大，生长速率在萌芽～分枝、显蕾～开花期达最大；干物重和鲜草重与活动积温在分枝～显蕾期同时达到最大值；水分是陇东紫花苜蓿气候生产潜力的主要限制因子，目前在中北部的黄土丘陵沟壑区尚有较大的气候生产潜力有待利用。Using the observed data of spring-sowed two years fresh alfalfa growth condition and parallel climatic conditions, analysis is made of the alfalfa＇s growth height and the speed variation rule with time in the loess plateau area of East Gansu, and the correlation dependence of dry matter and the fresh grass with the activity accumulated temperature. The model is revised according to the forage grass climate productivity photosynthesis output and the temperature and the precipitation, and the climate productivity of alfalfa is computed. The results show that, when sowed in spring, the growth height increase quantity reaches the top in blossoming-- withering and turning yellow period in the same year and flower bud appearing--florescence in the second year, while the fastest growth speed occurs in germinating--branching and flower bud appearing--florescence periods. The dry matter weight and fresh grass weight and the activity accumulated temperature reach the maximum simultaneously in branching-- flower bud appearing period. The moisture content is the main limiting factor of the alfalfa climate productivity potential in East Gansu. At present there is still a great deal of climate productivity potential in the center north loess knoll gully area for further use.

关 键 词：陇东地区 紫花苜蓿 生长规律 气候生产力 

分 类 号：S551.7[农业科学—作物学]