洞庭湖区植被覆盖度下降成因分析

基于EOS/MODIS、FY-3/MERSI卫星数据计算植被覆盖度和水体面积,结合土地分类数据、气象数据、夜间灯光数据、统计年鉴,通过定量化计算,探索洞庭湖区不同地表类型植被覆盖度下降的气候和人为成因。结果表明,2000—2019年洞庭湖植被覆盖度下降区域集中在水田、人口聚集区和湿地地类;从气候影响来看,水田、人口聚集区的植被下降与5—8月降水量偏少关系密切,湿地植被覆盖度下降的面积与气候变化、水体面积都有关,下降程度与水体面积变化关系更密切,三峡蓄水可减轻水体对湿地植被的影响;从人为因素看,水田、人口聚集区、湿地植被覆盖度分别受农业种植结构、地区生产总值、夜间灯光指数和杨树砍伐的影响。

设施作物光需求特性及光调控棚膜研究进展

本文对设施作物光需求特性及光调控棚膜的研发进展等进行了概述,分析了当前光调控棚膜研发和应用存在的问题,并对其未来发展提出建议。

新疆小麦麸皮脂肪含量及脂肪酸组成分析

以新疆不同地区的20种小麦麸皮为研究对象,对其脂肪含量进行测定并分析其脂肪酸组成,为开发麦麸相关功能食品提供科学依据。结果表明:20种小麦麸皮脂肪含量在1.8%~4.4%之间;共检测到18种脂肪酸,其中主要有亚油酸、油酸、棕榈酸、α-亚麻酸,在脂肪酸中的平均百分含量分别为56.7%、18.9%、16.4%、4.1%,不饱和脂肪酸含量在77.4%~83.7%之间。相关性分析显示,总脂肪酸的含量与亚油酸、油酸、棕榈酸和α-亚麻酸4种组分含量极显著相关。这些脂肪酸组分之间的相关性与它们共线性的合成途径有关。

Study on Weed Control and Safety of Tembotrione-Atrazine Tank Mixture in Spring Maize Fields

This study aimed to explore the effect of 5% tembotrione oil dispersion(OD)-38% atrazine suspension concentrate(SC) tank mixture on the weeds in spring maize fields and the safety of the mixture. To be specific, randomized block design was adopted for the field experiments. The results showed that the application of tankmixture of 5% tembotrione OD at 90 g a.i./hm^(2)and 38% atrazine SC at 570 g a.i./hm^(2)and the mixture of 5% tembotrione OD at 90 g a.i./hm^(2)and 38% atrazine SC at 1140 g a.i./hm^(2)respectively controlled 94.7%~96.3% and 94.0%~96.3% of the grass weeds, 94.7%~96.0% and 93.7%~95.7% fresh weight of grass weeds, 95.3%~96.3%and 93.3%~97.3% of broadleaf weeds, and 94.7%~96.0% and 93.3%~96.3% fresh weight of broadleaf weeds. The efficacy was better than that of the 5% tembotrione alone and the control herbicide and no phytotoxicity of the mixtures was identified.The tank mixture of tembotrione and atrazine should be promoted in the spring maize field for weed control and the recommended dosages were 90 g a.i./hm^(2)for 5%tembotrione and 570 g a.i./hm^(2)for 38% atrazine.