低温处理后,大叶相思和马占相思叶片中可溶性糖含量、可溶性蛋白质和游离脯氨酸含量均发生明显变化。低温处理过程中超氧化物歧化酶 (SOD)活性先降低后增加,而膜脂过氧化的主要产物丙二醛 (MDA)则随温度的降低而呈现出先增加后减少,然后再增加的趋势。外源脱落酸 (ABA)预处理可显著提高马占相思的抗寒力。

采用N、P、K 3营养元素 5个水平配比试验,分析不同配比对马占相思苗期生长的影响;通过正交试验,确定马占相思苗木对各营养元素的实际需求水平。结果表明,P素对马占相思苗期生长影响最大,其次为K素,而N素的影响相对较小。不同水平的N、P、K配比对试验苗有不同的影响,其中,N∶P∶K最佳配比为:190∶25∶160 (mg·L-1)。

The study involved estimating stem volume, calculating merchantable volume yielding rate and timber assortments volume with four parameter cylinder volume ratio stem profile. The result shows it performs better than Schumarher Hall at estimating stem volume when the data from Quercus aliena were classified by class. Compared with taper function at calculating merchantable volume yielding rate, four parameter cylinder volume ratio stem profile also performs well with systematic error below 1% and mean square error below 5%. To Pinus tabulaeformis trees, taper function has better accuracy degree than cylinder volume ratio method, but the result is contrary to Q.aliena. When calculating timber assortments volume with four parameter cylinder volume ratio method, systematic error is below 6% and mean square error below 19%.