论文部分内容阅读
云南植胶垦区,地处热带边缘,纬度北,海拔高,植胶热量不足,低温寒害是必然的。植胶二十四年来,共出现八次冷冬。给橡胶生产造成了灾害性损失。尤以1973/74年冬、1975/76年冬出现两次特大冷冬,橡胶损失更为严重。据普查结果1973/74年冬各种不同树龄胶树受害普遍率为66.4—79.5％;1975/76年冬为72.5—79.1％,并在植胶地带划分为中寒害区的阴坡、重寒害区的半阴坡及阴坡,目前尚没有一个无性系种植后不遭受寒害能够完全站得住脚。今后还需不断扩大植胶面积。现推广使用的品系已远远不能适应生产发展的需要。因此培育抗寒高产品系便成为迫切需要解决的问题。要在短时期内推荐抗寒性较强、产量又高的品系给生产使用,这是当务之急。为此,我们在历年培
Plastic planting reclamation area in Yunnan, located on the tropical edge, latitude north, high altitude, lack of plant heat, cold chilling is inevitable. Twenty four years of plasticizers, a total of eight cold winter. Caused a devastating loss to rubber production. Especially in the winter of 1973/74 and in the winter of 1975/76, there were two extraordinarily cold winters, and the rubber loss was even more serious. According to the results of the census, the prevalence rates of various age-at-risk gum trees were 66.4-79.5% in the winter of 1973/74 and 72.5-79.1% in the winter of 1975/76, respectively. Half-shady and shady slopes in the district, so far no clones have been able to survive without being affected by chilling injury. In the future need to continue to expand the area of plasticized glue. Now promote the use of strains far from being able to adapt to the needs of production and development. Therefore, the cultivation of high-cold-resistant products has become an urgent need to solve the problem. It is imperative to recommend high-cold-resistant and high-yielding lines to production for a short period of time. For this reason, we have cultivated over the years