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本文用压力室法测定了杉木、马尾松一年生裸根苗的水分关系参数,并研究了晾晒失水对两树种根生长势以及造林成活率的影响。结果表明:马尾松苗木零膨压点的渗透势(-2.07Mpa)和原初渗透势(-1.29Mpa)均低于杉木(-1.80Mpa和-1.08Mpa)。马尾松苗木的零膨压点渗透水体积与原初渗透水体积之比(63.27%)高于杉木(58.03%)。说明马尾松苗木的耐旱能力强于杉木。随着失水时间的延长,两树种苗木的根生长势和造林成活率均显著下降。失水仅两小时后,两树种的造林成活率均低于40%。本文提出,杉木和马尾松苗木造林成活的水势阀值分别为-1.60Mpa和 1.70Mpa。图4表4参18。
In this paper, the relationship between the moisture content of bare annual shoots of Chinese fir and Pinus massoniana was determined by pressure chamber method. The effects of drying on water loss on root growth and survival rate of two species were studied. The results showed that the osmotic potential (-2.07Mpa) and original initial osmotic potential (-1.29Mpa) at the zero-tress point of P. massoniana seedlings were lower than those of Chinese fir (-1.80Mpa and -1.08Mpa). The ratio of osmotic water volume to original osmotic water volume of Masson pine seedlings (63.27%) was higher than that of Chinese fir (58.03%). This shows that the drought tolerance of Masson pine seedlings is stronger than that of Chinese fir. With the extension of dehydration time, the root growth potential and afforestation survival rate of two tree seedlings decreased significantly. After only two hours of water loss, the afforestation survival rates of both species were below 40%. This paper proposes that the threshold of water potential for afforestation of fir and masson pine seedlings is -1.60Mpa and 1.70Mpa, respectively. Figure 4 Table 4 Reference 18.