关键词: 异构数字资源, 异构数字资源, 统一检索, CURL, 嗅觉器

Abstract:

To reduce plastic pollution of farmland and improve utilization efficiency of temperature and water of crops. Study the effects of film mulching on soil temperature, moisture and growth of sunflowers in dryland, plastic film mulching tests were simulated in the north foot of the Yinshan Mountain. The results showed that: the average earth temperature increased about 3℃ of plastic film treats, and warming effect of Japan's degradation film was the most significant. In 2009 and 2010, water use efficiency of Japanese degradable mulch was 8.19 kg/(hm2?mm), 7.23 kg/(hm2?mm) respectively, which was higher than other treatments. The results of the sunflower growth and development conditions showed that: the growth process of sunflower dealt with Japanese film was advanced than that in open field and that treated with Guangdong membrane. There was no significant difference between Japanese films and ordinary films with the most characters, whereas those characters such as kernels yield were significantly higher than those of un-mulching treatments. Analysis from the degradation results showed that: sunflower crossing over the low temperature period 90 days after, the Japanese film broken down into pieces quickly. To sum up, the Japanese film could enhance the ability of soil moisture conservation and increase sunflower yield, at the same time it was environmental, so we should popularize the Japanese degradable mulch in arid and semi-arid areas.