乳山湾东流区丰水期（8月）有机物及营养盐的环境容量

应用水质预测模型,分别采用海水一类水质标准和富营养化范围值的下限值作为相应要素的预测浓度,并根据１９９４年８月乳山湾东流区湾内外现场浓度,对其单位潮周期的化学耗氧量,无机氮和无机磷的环境容量进行了预测。根据预测结果,结合匡国瑞（１９８５）同期乳山湾东流区相应要素的环境容量的预测结果进行了比较分析。     

土壤养分空间变异性的随机模拟及其应用

把随机模拟技术引入土壤养分的空间变异性研究中,对土壤养分空间分布的不确定性进行描述。将随机模拟值与克里格插值及实测值进行对比分析。利用一系列随机模拟值计算出空间某点处土壤养分特性值不超过（或者超过）某个临界值的概率,可以对依据插值结果作出的施肥决策给予评价。     

Decomposition rates of forest residues and soil fertility after clear‐cutting of Eucalyptus grandis stands in response to site management and fertilizer application

Forest residues (i.e. harvest residues and litter) are important nutrient sources for trees because soils of poor fertility are used for eucalypt plantations in Brazil. Understanding the dynamics of decomposition for these residues and their effects on soil fertility are relevant for the management of forest plantations. The objectives with this study were to assess the effects of forest residue management and fertilizer, both applied in the establishment of a Eucalyptus grandis Hill ex Maiden stand, on the decomposition rate (k), nutrient release and soil fertility after harvest of this stand. The treatments were applied to a plantation (R1). After 8 yr, R1 was clear‐cut and all of the treatments were reapplied to a new planting (R2). At the end of R1 (age of 8 yr), there was a reduction of 10% in the wood volume in the treatment with the forest residues removed and 36% reduction with no fertilizer application. At the end of 1 yr for plantation R2, these reductions were 30 and 57%, respectively. Residue decomposition under R2 was assessed by a new approach that involved collecting samples directly on the site without using litter bags. The k of forest residues was 3.6 for leaves, 1.2 for bark and 0.8 for branches. The application of small rates of N and P fertilizer did not influence the k of forest residues. In the first 300 days after clear‐cutting, approximately 50% of N, P, Ca, Mg and S and 80% of K in the forest residues were released. Even so, this did not result in significant changes in soil fertility levels. Only small reductions in soil N and P contents over time and changes in topsoil pH resulted from forest residue removal.     

STUDIES ON STRUCTURE AND FUNCTIONS OF MONGOLIAN OAK FORESTS

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氮、磷、钾亏缺对玉米植株性状、叶片结构与生理特性的影响

采用掖单2号玉米良种,于春季在温室中溶液培养。试验为四个处理,即-N、-P、-K、和全素(ck)。在叶片出现典型缺素症状时观测。结果表明:玉米缺乏N、P、K,植株矮小,干重降低;叶肉细胞小,叶绿体超微结构发育不良,形态异常;叶绿素含量少,光合强度降低,氨基酸合成受到影响。其中尤以缺N者影响最严重。     

类胰岛素生长因子及其营养调控

动物肝脏分泌及肝外组织合成的类胰岛素生长因子 (IGF)是动物生长发育的重要调节因子 ,也是生长激素和营养物质发挥促生长作用的主要介导因子。IGF本身的合成与分泌不但受生长激素的影响 ,也受营养状况的调节。本文在介绍IGF的研究历史和生化特性基础上 ,综述了IGF在机体物质代谢和细胞生长中的调节作用以及激素和营养状况对IGF合成与分泌的影响 ,为进一步研究IGF与营养的关系提供参考     

板栗空苞机理的研究

板栗(Castanea mallissima Blume)空苞主要是在双受精作用完成后、初生胚乳细胞分裂为一团游离核,不再继续分裂,受精卵未能从胚乳细胞中得到发育所需的营养物质,处于停滞状态。空苞发生前后,空苞株与正常株的总苞及于房中可溶性蛋白质含量、过氧化氢酶活性、过氧化物酶同工酶谱,均有差异。试验表明,胚囊发育和双受精作用期及时供给外源多维营养元素能有效地控制板栗空苞的发生。     

缺苞箭竹养分含量动态特征的研究

本项研究对缺苞箭竹不同器官不同月份的氮、磷和钾的含量分布和动态特征进行了测定和分析。结果表明:不同器官之间的养分含量差异很大。叶片的氮、磷含量此其它器官高出两倍或两倍以上。笋是含钾量最高的器官,地下茎和二年以上的秆最低。三种主要营养元素在各月的变化规律大体相似,尤其氮、磷在相同器官中的动态特征极为一致。幼嫩器官的养分含量变化幅度最大,多年生竹秆和枝的变幅最小,多年生叶和二年生竹秆居中。亚高山暗针叶林区较低的气温,是造成林下竹子缺乏磷素的主要原因。     

松口蘑及其活性物质研究进展

详细论述了松口蘑的生物学特性，菌丝生长的营养需求，分离鉴定方法，栽培技术及深层发酵技术，同时综述了松口蘑的生物学特性及活性物质的研究进展，并讨论了松口蘑的研究方向和发展前景。     

稳态营养对湿地松容器苗Pt外生菌根形成及生长效应研究

在非控制条件下，按稳态矿质营养理论与技术，对接种与不接种Ｐｔ外生菌根菌剂的湿地松芽苗，分别以０％、５．３％、６．４％、７．５％营养物相对添加速率进行施肥处理。通过观测苗木生长，根系和菌根发育，生物量积累，以及叶片营养元素和叶绿素含量，研究湿地松芽苗Ｐｔ外生菌根形成的外界营养水平及生长效应。结果表明，Ｐｔ接种苗平均株同、地径、株干重基本上随营养物添加速率提高而提高，其中７．５处理比０处理分别提高２６