马尾松低产林套种木荷的林地与根际土壤养分特性的研究

马尾松低产林套种木荷的混交林林地与根际土壤养分特性研究表明，木荷根际对土壤养分的活化能力大于马尾松，这利于混交林中马尾松的生长．套种后所形成的混交林根际微区对土壤养分活化程度的提高改善了两树种的养分利用状况，这可能是低产林改造后林地土壤养分高于纯林地且林分生产力提高的主要原因之一．     

木荷林带阻火性研究

采用锥型量热计和野外火烧试验方法研究木荷林带的阻火能力。锥型量热计采用75kW／m^2辐射强度、外部点燃条件下，测试木荷(Schima superba)与马尾松(Pinus massoniana)落叶的燃烧过程。结果表明，马尾松落叶的热释放速率峰值高(146kW／m^2)，能量释放快。木荷落叶燃烧缓慢且释放热量少。野外火烧试验对室内试验结果进行了验证。火烧前后分别测定木荷林带和马尾松林的可燃物分布，试验火以地表火为主，蔓延速度为2．2m／min，火线强度168～2961kW／m,有些地段由于可燃物较多，发生了树冠火，火焰高度达到8～8．5m，火线强度达24.881～28379kW／m。火烧后林带受害不严重，无树木死亡。试验证明，木荷林带可以有效阻隔地表火和树冠火的蔓延，浓厚树冠层也可以阻挡短距离的飞火。     

酸雨对鼎湖山土壤的累积效应及荷木的反应

运用盆栽实验研究了酸雨对鼎湖山季风常绿阔叶林土壤危害的累积效应和优势树种荷木的一些生理反应.结果表明,在酸雨直接淋洗土壤的条件下,与对照相比,土壤酸度,土壤淋洗液酸度增加;土壤交换性K⁺、Na⁺上升,Ca²⁺、Mg²⁺和有效Mn、Zn下降;土壤淋洗液中K、Na含量下降,Ca、Mg、Cu、Fe、Mn和Al在pH3.05的酸雨处理下含量显著上升;但生长于模拟酸雨土壤中的荷木在土壤化学性质发生变化后仍能健康生长.     

Effects of simulated acid rain on root growth of Cunninghamia lanceolata and Schima superba saplings planted in acidified soil

Results from pot culture (with one-year old Cunninghamia lanceolata and Schima superba) are described. It was found that the biomass production and elongation of C. lanceolata was seriously inhibited at pH 2.0 rain, but for S. superba, was not affected markedly. When pH values of experimental rain were higher than 2.0, the root growth of both species was not adversely affected. Aluminium had already accumulated to some degrees in the roots of both trees, and started to affect the root growth of C. lanceolata at pH 2.0 rain. The soil chemistry was also examined. Increased acidity of experimental rain increased the leaching of Ca and Mg. The Al/Ca mol ratio increased from 0.3 to 0.9 in top soil, and in rhizosphere to 1.5 when the pH values of simulated acid rain were 4.5 to 2.0. In this experiment, NO₃- fertilization effect was discovered.     

森林凋落物对土壤酸化缓冲作用的初步研究

阔叶树木荷凋落物的灰分元素含量以及分解速率大大高于针叶树杉木凋落物。相比之下,木荷凋落物具有较高的缓冲酸化的潜在能力。覆盖木荷凋落物的土壤,其下渗液盐基含量和PH值与对照相比显著较高,而土壤本身的盐基饱和度和有机质含量也显著较高,土壤酸度和Al/Ca显著较低,即太荷凋落物对土壤酸化有较高的缓冲能力,而杉木凋落物则不然。