利用1993年和1994年测定数据,采用球果饱满种子百分率方法估算马尾松无性系种子园异交率。研究发现8～9年生马尾松无性系种子园在结实初期自交率较高,异交水平较低。利用不同杂交组合估算的各亲本无性系在自由授粉情况下的异交率差异较大,两年中分别为44.7%～98.1%和30.8%～96.8%,平均为73.5%(标准误差SE=17.3%)和69.2%(标准误差SE=21.3%)。异交率在无性系间变异较小,在无性系内不同组合间变异较大,前者变异系数仅为后者的35.3%～53.0%。相同双亲组合的异交率在相邻两年度间差异不显著,并存在着显著的正相关。同时,还发现异交率与座果率有显著的线性正相关关系。最后对影响异交率的主要因素进行了讨论。

针对马褂木不具原生根原基, 穗条扦插不易生根这一特性, 对影响扦插生根的母树年龄、穗条枝龄、扦插基质、扦插季节、生根特点以及插后管理等因子进行了比较系统的试验研究, 提高了扦插成活率。一般扦插生根成活率可达80%, 如采用带顶芽嫩枝穗条扦插高达91. 4%。鉴于嫩枝扦插效果突出, 遂又增设采穗圃研建内容, 以供大批量培育嫩枝扦插苗, 形成了自采穗圃营建、采穗、扦插到插后管理等一套完整而简易高效的杂种马褂木扦插繁殖实用技术。

The morphology of mature male cones was observed and the impact of climate was studied. The collecting days of mature pollen at Chun'an County, Zhejiang Province, was during the 3-5-days period from the end of Mach to the beginning of April in normal temperature years, which would be 3-5 days later in low temperature years and 3-5 days earlier in high temperature years. The male cones at lower elevation blossom 6-8 days earlier than those at the elevation of 120-550 m. Therefore, it is practical to prolong reasonably the collecting period of pollen.

The damage of Dioryctria yiai on young shoots of Pinus massoniana and the influence of this pest insect on development of male cone and pollen were studied. It is demonstrated that the wormhole of D. yiai is harmful to the development of male cone, microsporophyll and pollen in the next year. The length and diameter of male cone and microsporophyll number decreased and accounted for 33.3% and 40.2% of the health plant, respectively. The vertical and transverse diameter of microsporophyll accounted for 62.0% and 71.0% of the health plant, and the fresh and dry weight of microsporophyll accounted for 30.3% and 43.6% of the health plant. It is concluded that D. yiai could seriously damage the young shoot of P. massoniana and cause bad development of male cone shoot and pollen abortion.

以浙北、闽北和赣南3个木荷代表性种源为试验材料,比较不同氮沉降水平下,木荷幼苗叶片的光合-光响应曲线、氮和磷含量、光合色素含量及可溶性蛋白含量之间的差异。结果表明:(1)中、低氮沉降水平促进了木荷幼苗叶片的光合能力,降低了呼吸消耗,叶片氮含量及叶绿素含量增高,叶片磷含量及可溶性蛋白含量降低,光合同化物易于积累;而高氮沉降水平时对光合能力的促进作用减小甚至产生危害。(2)木荷不同种源间叶片利用光能的程度差异较大,浙江杭州种源净光合速率较高,利用弱光的能力强,易发生光抑制现象,光合同化物不易积累;福建建瓯种源利用强光能力强,暗呼吸速率较低,同化物最容易积累;江西信丰种源光合能力和暗呼吸速率介于浙江杭州和福建建瓯种源之间。(3)低氮沉降水平对北部浙江杭州种源促进性强,叶片叶绿素和可溶性蛋白含量增加,光合能力增强,同时暗呼吸速率降低;中氮沉降水平对福建建瓯种源生产力促进最大,而叶绿素及可溶性蛋白含量在此水平下却较低;低氮沉降水平显著促进了南部江西信丰种源的净光合速率及利用弱光能力,呼吸消耗却并未显著增长,叶片可溶性蛋白增多。因此,在森林土壤磷含量较低的环境下,木荷育种不仅要考虑不同种源间的生长差异,同时也要充分考虑氮沉降的影响,才能达到最佳效果。