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在云南省林业科学院漾濞研究站的苗圃地内对美国山核桃1年生播种苗进行了全年的生长和生物量测定,并对其苗木的形态特征作了研究。据此,将美国山核桃1年生播种苗的生长划分为出苗期、幼嫩期、速生期和苗木硬化期4个时期。美国山核桃1年生播种苗在其生长期中苗高生长的速生期全年仅1次,而地径速生期则出现3次;其苗木地上部分粗壮、地下部分具深根性,地下部分生物量占全株的73.52%,全株含水量是其干生物量的1.36倍。
In the nursery of Yangbi Research Station of Yunnan Academy of Forestry, the annual growth and biomass of perennial seedlings of pecan were measured and the morphological characteristics of seedlings were studied. Accordingly, the growth of perennial seedlings planted in the United States is divided into four stages: emergence, tenderness, fast-growing and seedling hardening. Perennial seedlings planted in the United States in the growth period of seedling height growth of the fast-growing period only once a year, and the rapid growth of soil occurs three times; the seedling aboveground parts stout, underground parts with deep root, underground biomass Accounting for 73.52% of the whole plant, the whole plant water content is 1.36 times of its dry biomass.