论文部分内容阅读
凋落物由植物产生并最终归还给土壤,为分解者提供物质和能量的来源。以塔克拉玛干沙漠公路沿线防护林为对象,2014年对各林龄防护林内的凋落物量、凋落物组成及动态变化进行研究。结果表明:沙漠公路8、10、13、16、19a防护林年总凋落量分别为8 301.96、9 089.71、10 540.64、6 184.70、7 929.95kg·hm-2。各林龄防护林凋落物组成均以乔木状沙拐枣(Calligonum arborescens)同化枝、梭梭(Haloxylon ammodendron)同化枝和多枝柽柳(Tamarix ramosissima)枝凋落物占的比例最大,3种凋落物总量占年总凋落量的比例分别为89.05%、79.16%、75.28%、78.75%、81.14%。各凋落物组分在不同林龄间差异显著(P<0.05)。不同林龄防护林皆表现出春、秋季凋落量高,夏、冬季凋落量低的季节动态。各林龄防护林凋落物总量及主要凋落物的凋落量月动态变化曲线均呈现三峰型,在3—5月、7月和9—11月出现峰值,叶、果和其他的凋落量呈不规则变化,花只在4—8月凋落。
The litter is produced by the plant and eventually returned to the soil, providing the decomposer with a source of matter and energy. Taking the shelterbelt along the Taklamakan Desert Highway as an object, the litterfall, litter composition and dynamic changes in shelterbelts were studied in 2014. The results showed that the annual total litterfall of the shelterbelts on the 8th, 10th, 13th, 16th and 19th centuries in the desert highway were 8 301.96,9 089.71,10 540.64,6 184.70 and 7 929.95kg · hm-2, respectively. The litter composition of shelterbelts in each age group was dominated by Calligonum arborescens assimilation branch, Haloxylon ammodendron assimilation branch and Tamarix ramosissima branch litter accounted for the largest proportion. The litter proportion of the three litters The total amount of annual litterfall was 89.05%, 79.16%, 75.28%, 78.75% and 81.14% respectively. The litter components in different age were significantly different (P <0.05). The different ages of shelterbelts all showed the seasonal dynamics of high litterfall in spring and autumn and low litterfall in summer and winter. The monthly variations of total litterfalls and litterfalls of litter in litterfalls showed a three-peaked curve at each age, with peak values in March-May, July and September-November. The litterfalls of leaves, fruits and other litters were not significant The rules change, flowers only 4 - August litter.