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1 樟子松生物学特性及天然分布1.1 生物学特征樟子松耐寒性强 ,休眠期能忍受 - 40～ - 5 0℃低温 ,春季生长期间能忍受 - 6 .5℃低温 ;树冠稀疏 ,针叶少且短小 ,具发达的角质层、气孔深陷且密度小 ,表皮细胞致密 ,束缚水含量高 ,保水能力强 ;叶绿素含量大 ,积累干物质多。因
1 Pinus sylvestris biological characteristics and natural distribution 1.1 biological characteristics Pinus sylvestris strong cold tolerance, dormant can tolerate - 40 ~ - 50 ℃ low temperature, spring growth can withstand - 6.5 ℃ low temperature; sparse canopy, needle Leaves less and shorter, with developed stratum corneum, stomatal depression and density of small, dense epidermal cells, irreducible water content, water retention capacity; chlorophyll content, the accumulation of dry matter and more. because