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21.
The relationship between physical hydrodynamic processes and nutrients dynamics was investigated in Mida creek, a groundwater influenced mangrovefringed creek in Kenya between March 1996 and May 1997. The research involved spot and timeseries measurement of nitrate–nitrite, ammonia, silicates, phosphates, salinity, temperature, sealevel as well as tidal currents at seven stations located in the front, middle and backwater zones of the creek. Groundwater level as well as total dissolved solids' concentration, salinity, temperature and nutrients' concentration were also measured once every month in shallow wells (watertable<5m) located in the upper region of the creek. Results of the study show that nutrient concentrations vary with the tide and that, though there is no river drainage, they are of the same magnitude as in mangrove creeks with substantial river runoff. The peak concentrations of NH
4
+
–N (5.45M), NO
2
–NO
3
(5.63M), PO
4
3–
–P (0.58M) and SiO
3
2–
–Si (81.36M) in the creek occurred during flood tide, 2–3h before high waters. The (NO
2
–
+ NO
3
–
)–N concentrations declined rapidly during ebb tide, reaching the minimum levels during low water. Contribution of groundwater seepage to the net nutrients flux (particularly on nitrite–nitrates) is largest in dry seasons. The study shows that groundwater outflow sustains the mangroves during periods of severe salinity stress and nutrients deficiency in dry seasons. This is essentially by limiting salinity increase and by boosting nutrient supply in dry seasons. 相似文献
22.
以193株采割松脂的湿地松为材料,每株用105个单刀的产脂量.共2万余个数据为基础.经分析计算得出胸径和冠幅是影响湿地松产脂量的主导因子.并以胸径和冠幅、胸径为解释变量,分别求出湿地松林分产脂量的预测模型.编制出湿地松一元、二元产脂量表.经检验平均误差均小于±3.5%. 相似文献
23.
Guillermo Trincado V. Raúl Quezada P. Klaus von Gadow 《Forest Ecology and Management》2003,180(1-3):443-451
The study compares two methods of stand table projection based on data from young Eucalyptus nitens (Maiden) plantations in Chile. The projected diameter distributions were estimated using the methods proposed by Nepal and Somers (1992) [For. Sci. 38 (1992) 120] and Cao and Baldwin (1999) [For. Sci. 45 (1999) 506]. The evaluation compared the observed and estimated diameter distributions for different projection intervals, using the Kolmogorov–Smirnov test and an error index called ‘relative discrepancy’. The evaluation showed that both methods are suitable for application in the Eucalypt plantations. However, the method proposed by Nepal and Somers proved to be more accurate, especially when the projection period extends over 4 years or more. Expected error and bias for the observed and estimated total and merchantable volumes at stand level were also evaluated. The observed error and bias were relatively low for both methods; however, some differences were detected when the volume distributions were analyzed at diameter class level. 相似文献
24.
25.
传统收获表是指某一树种在特定地区和管理体系下,以立地条件和年龄为变量描述林分平均生长过程的数表.林分密度管理图是根据林分密度效果编制的可预测林分平均收获的图.通过与传统收获表和林分密度管理图的概观比较和探讨,该文系统地阐述了系统收获表的概念和功能.系统收获表的基本特点是为预测现实林分在不同立地条件和管理体系下生长过程的计算机程序.因此,系统收获表能描述在多维变量(如年龄、立地条件、林分密度、胸径和树高)条件下的现实林分和单木的无数生长过程 相似文献
26.
中国紫胶虫(Kerriachinensis)与其它胶蚧一样,均隐匿在其胶被内生长发育,外观难以看到各虫龄期的体形特征。用图表形式把各虫龄期及其相关的泌胶形态和冬夏两代各自所需无数标出,即可清楚看出该虫生活史、生活周期及各发育阶段期间的变化和关系。同时,列出各虫龄期特征检索表,便于在科研与生产中应用。 相似文献
27.
28.
本文提出以林分构成因子——林分胸高总断面积及林分平均高,估计林分蓄积量的办法,选取9种方程求解参数,配合了最优林分蓄积量经验方程,制定出《福州地区人工杉木林分蓄积量表》,对完善我省林业数表的种类、形式和内容,进行了初步尝试。 相似文献
30.