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为了解樟子松幼苗对强风沙流不同时间吹袭的生理生态响应,2013年春季在内蒙古科尔沁沙地研究了8级大风下强风沙流(风速18 m·s-1,风沙流强度173 g·cm-1·min-1)吹袭10、20和30 min樟子松幼苗生长特性和一些生理指标的变化。结果表明:随着风吹时间增加,其株高生长速率下降,茎粗和冠幅生长加快,叶色发黄脱落量增加;与非风吹对照(CK)相比,30 min风吹处理的株高增长量下降52.6%,茎粗增长量、冠幅增长量和叶色发黄脱落量分别增加251.9%、256.0%和466.7%;随风吹时间增加,叶片相对含水量(RWC)和超氧化物歧化酶(SOD)活性下降,丙二醛(MDA)含量、膜透性、过氧化物酶(POD)活性、可溶性糖和脯氨酸含量趋于增加;与CK相比,30 min风吹处理的RWC下降4.1%,MDA和膜透性分别增加10.3%和9.3%,SOD活性下降1.9%,POD活性、可溶性糖和脯氨酸含量分别增加55.5%、26.4%和50.0%。结果说明,强风沙流持续吹袭造成樟子松幼苗水分胁迫,使其高生长受抑,部分叶片发黄脱落,叶片膜脂过氧化加剧,细胞膜受损,为适应强风沙流吹袭,樟子松幼苗加快了茎粗和冠幅生长,通过增加POD活性和可溶性糖、脯氨酸含量以减轻细胞膜伤害,维持细胞正常膨压。
In order to understand the physiological and ecological responses of Pinus sylvestris var. Mongolica to strong winds of sand blown at different times in the spring of 2013, strong winds of sand (wind speed 18 m · s-1, wind gust 173 g · cm -1 -1 · min-1). The growth characteristics and some physiological indexes of seedlings of Pinus sylvestris var. The results showed that with the increase of wind blowing time, the growth rate of plant height was decreased, the growth of stem diameter and crown width was accelerated, and the yellowing loss of leaf color was increased. Compared with CK, The plant height increased by 52.6%, the stems increased, the crown growth and the yellowing loss of leaves increased by 251.9%, 256.0% and 466.7% respectively. With the increase of wind blowing time, the relative water content (RWC) The activities of SOD, MDA, membrane permeability, peroxidase (POD) activity, soluble sugar and proline content tended to increase. Compared with CK, 30 min of wind RWC decreased by 4.1%, MDA and membrane permeability increased by 10.3% and 9.3%, SOD activity decreased by 1.9%, POD activity, soluble sugar and proline content increased 55.5%, 26.4% and 50.0% respectively. The results showed that the strong wind and sand flow caused the water stress of Pinus sylvestris seedlings, which inhibited the growth of seedlings. Some of the leaves had yellowing and shedding, the lipid peroxidation of leaves was aggravated and the cell membrane was damaged. In order to adapt to the strong wind flow, Seedling speed up the stem diameter and crown growth by increasing POD activity and soluble sugar, proline content to reduce cell membrane damage, maintain normal cell turgor.