秭归县退耕还林水源涵养效益计量

林地是森林水源涵养效益的主体,通过对秭归县10种退耕还林模式的土壤物理性状和林地水源涵养效益的研究,结果表明:(1)退耕还林后土壤总孔隙度增加4·3%~20·2%,除柏木林外,非毛管孔隙度增加6·8%~494·2%;(2)退耕还林后土壤饱和蓄水量增加5·7%~118·8%,非毛管蓄水量为坡耕地的2·58~19·13倍;(3)秭归县退耕还林森林土壤的蓄水量为171·6万m3/a,是相似立地条件下农耕地的3·21倍。     

不同覆盖处理对元宝枫叶生物活性物质含量的影响

以2年生元宝枫苗为试材,对其进行不同覆盖处理,测定叶内黄酮、绿原酸、叶绿素、SOD活性酶和丙二醛的含量,并进行方差分析和多重比较.结果表明:不同覆盖处理对元宝枫叶中生物活性物质含量的影响十分明显,黄酮含量在白膜覆盖下最高,绿原酸和叶绿素含量在绿膜覆盖下最高,SOD酶活性和丙二醛含量在红膜覆盖下最高,黄酮、叶绿素、丙二醛含量在不同覆盖处理下均以α=0.01水平上差异极显著,SOD酶活性和绿原酸含量以α=0.05水平上差异显著.     

Genetic Relationships among Prunus mume var. pendula Using AFLP Markers

Genetic relationships among Prunus mume var. pendula were studied by using AFLP markers. 18 accessions representing 14 cultivars ofPrunus murne var. pendula were selected from the germplasm collection at the Research Center of China Mci Flower. Seven Mse I-EcoR I AFLP primer combinations revealed 450 legible bands, and 269 of which were polymorphic markers. A similarity matrix was prepared using the simple matching coefficient of similarity and Nei‘s (72) distance coefficient. A UPGMA dendrogram demonstrated the genetic relationships of the cultivars. The information given by AFLP markers was basically consistent with the morphological classification and the evolutionary history of the morphotypes, and roughly supported the new revised classification system for Chinese Mci Cultivars. But there were still several exceptions: 1) the ‘Guhong Chuizhi‘ inserted between the ‘Tiaoxue Chuizhi‘ and the ‘Danfen Chuizhi‘; 2) the ‘Wufu Chuizhi‘ kept off the Pink Pendant Form, and the ‘Moshan Chuizhi‘ was removed from Viridiflora Pendant Form; 3) the ‘Danbi Chuizhi‘ and the ‘Shuangbi Chuizhi‘ of Viridiflora Pendant Form got together well but fell within the Pink Pendant Form.     

Active X控件实现工程索道线路计算程序中数据的输入输出

线路计算是工程索道设计中计算量最大的内容。本文利用Visual C＋＋6．0的Active X控件，结合单索循环式工程索道线路计算的编程，介绍如何实现程序中数据的输入输出。     

青海省栒子属观赏植物引种栽培试验

通过对Xun子属植物的引种栽培试验，对其在西宁地区的生长发育规律及其适应性做了系统的观察研究与评价，找出了栽培繁殖技术的最佳条件与方法，为今后扩大栽培与繁殖提供了依据。     

Essential oil from the leaves of Cryptomeria japonica acts as a silverfish (Lepisma saccharina) repellent and insecticide

This is the first article to report the evaluation of a natural product used as an antisilverfish agent. Silverfish (Lepisma saccharina), primitive wingless insects, feed on a variety of materials, including paper, cotton, starch, and cereals. They can be a problem in libraries and other places where books, documents, and papers are stored. In this pilot study, the essential oil from leaves of Cryptomeria japonica was investigated to test its properties as a silverfish repellent and insecticide. The results from a repellency bioassay show that the essential oil significantly repelled silverfish. The repellent activity was 80% at a dosage of 0.01 mg/cm³. When silverfish were exposed to a concentration of 0.16 mg/cm³ of essential oil, they were killed within 10h. The chemical composition of essential oil, the emissions from a test chamber, and the residue left on filter papers previously soaked with the essential oil in a chamber were analyzed by gas chromatography-mass spectrometry. The components of the essential oil were found to be: elemol (18.22%), 16-kaurene (11.63%), 3-carene (9.66%), sabinene (9.37%), 4-terpineol (9.06%), β-eudesmol (5.70%), α-pinene (5.62%), and limonene (5.26%). Only some constituents of the essential oil compounds collected by solid-phase microextraction were found to be emitted in the test chamber. The main constituents were: 3-carene (21.03%), p-cymene (10.95%), limonene (9.49%), β-myrcene (9.39%), γ-terpinene (9.10%), α-terpinene (8.57%), and 4-terpineol (7.97%).     

枣树绿枝扦插试验研究

本试验选用当年生半木质化枣头发育枝作扦插材料，用不同激素、不同浓度进行处理，以河沙做扦插基质；用塑料小拱棚和人工洒水调控温湿度；用竹帘搭棚遮荫简单行的方法，使枣树绿枝扦插当年成活率达８５％以上。冬季采用覆麦草越冬。     

马尾松种子园及其附近人工林的亲子代群体遗传结构分析

利用同工酶标记对广西覃塘林场马尾松无性系种子园及其附近一人工林的亲子代群体遗传结构进行研究。研究结果表明，不论是种子园还是附近人工林均表现为：亲代群体处于遗传平衡状态，杂合体相对过量，但子代已偏离遗传平衡，杂合体相对不足，亲子代的基因频率变化不大。种子园亲代群体的遗传多样性略高于子代，而附近人工林的亲代群体遗传多样性略低于子代。本文研究的种子园具有较宽的遗传基础，该种子园附近人工林的遗传多样性与种子园接近，但不论是人工林本身还是它的子代其多样性平均水平都较种子园的亲代和子代略低。     

巴拉圭冬青引种栽培及其开发利用研究

巴拉圭冬青为原产于南美洲的一种常绿树种, 具有降低胆固醇、保护肝脏和心脑血管、刺激中枢神经系统等作用。由其叶子加工成的茶广泛受到当地居民的喜爱, 近年来在美国、欧洲国家的发展也很迅速。文中简要介绍了巴拉圭冬青的形态及生物学特性、分布与原产地概况、世界各地引种栽培及其在食品、饮料、医药方面的传统利用和产业化开发现状, 根据其生物气候参数分析了我国适宜引种区域并展望在我国引种与推广应用前景。