测土配方施肥对杨树生长的影响

Influence on growth of poplar by soil testing and formulated fertilization

于湖南省益阳市南县选择2年生杨树优良家系林,研究测土配方施肥对杨树生长及叶片、枝条中养分含量以及土壤养分含量的影响。结果表明:施肥2年后,试验组平均树高、平均胸径增长率比对照组分别提高22%与19%;叶片(枝条)中全N、全P、全K的平均含量分别提高了29.21%、51.87%、46.42%(23.42%、13.85%、16.33%);土壤中全N含量变化与树高增长、胸径增长呈显著正相关,数学模型分别为y=36.24+0.097 x、y=52.249+0.143 x;土壤全K含量变化与树高增长呈显著正相关,数学模型为y=33.689+0.203 x;叶片中全N含量变化与树高增长呈显著正相关,数学模型为y=35.351+0.108 x;叶片中全P含量变化与树高增长、胸径增长均呈显著正相关,数学模型分别为y=35.928+0.050 x、y=51.600+0.077x;枝条中全K含量变化与树高增长呈显著正相关,与胸径增长呈极显著正相关,数学模型分别为y=36.075+0.148 x、y=51.745+0.236 x。

A two-year-old poplar experimental forest was selected, in order to study the influence on the growth of pop- lar, nutrient content in leaves and branches and soil fertility through soil testing and formulated fertilization. The result showed that, two years after fertilization, the average plant height and average DBH of experimental group, respectively, growth higher 22% and 19% than the control group, the content of total N, total P, total K in poplar leaves （bran- ches） increased by 29.21% , 51.87% and 46.42% （23.42%, 13.85% and 16.33% ） , respectively. There were significant positive correlation between the content change of total N in soil and plant height and DBH growth, the mathe- matical model were y = 36.24 ＋ 0. 097 x, y = 52. 249 ＋ 0. 143 x, respectively. There was a significant positive correlation between tile content change of total K in soil and plant height growth, the mathematical model was y = 33. 689 ＋ 0. 203 x. There was a significant positive correlation between the content change of total N in leaves and plant height growth, the mathematical model was y = 35. 351 ＋ 0. 108 x. There were significant positive correlation between the content change of total P in leaves and plant height and DBH growth, the mathematical model were y =35. 928 ＋0. 050 x, y =51. 600 ＋ 0. 077 x, respectively. Also there was significant positive correlation between the content change of total K in branches and plant height, and very significant positive correlation between the content change of total K in branches and DBH growth, the mathematical model were y = 36. 075 ＋ 0. 148 x, y = 51. 745 ＋ 0. 236 x, respectively.