CCROP—Simulation model for container-grown nursery plant production

Container Crop Resource Optimization Program (CCROP) is an integrative model which simulates the growth and water and nutrient requirements of a woody ornamental shrub grown in small (2.8–11.4 L) containers in a field environment with overhead sprinkler irrigation. The model was developed for producers, producer advisers and researchers to support best management practice decision-making in container nursery production. We describe the primary processes simulated by CCROP particularly how they differ from traditional crops grown in-ground and assess the ability of CCROP to simulate measured values for a range of irrigation and fertilizer trials and transplanting dates. Results of model testing with 11 trials indicate that CCROP provided reasonable outcomes for biomass and leaf area growth as well as evapotranspiration, runoff (container drainage plus un-intercepted irrigation and rainfall) and nitrogen loss.     

The influence of water stress and air velocity on growth of Impatiens walleriana and Petunia × hybrid

Impatiens walleriana ‘DeZire’ and Petunia × hybrid ‘Tidal Wave’ were subjected to a combination of water stress and exposure to wind to evaluate the potential application of these treatments as an alternative to chemical growth retardation. Air velocities evaluated were 0.1, 0.2, 0.4, 0.8, 1.5, and 4.5 m s⁻¹ and irrigation treatments were either control or 45% water stress based on irrigation occurring when the weight of the plant (plant, pot and peat) was reduced by 25% (control) or 45% (water stress) of the initial weight. The experiment was repeated twice; once in spring and once in summer.     

论南方红黄壤地区饲草开发利用的几种途径

本文在论述我国南方红黄壤地区的自然特征、社会经济、资源与环境现状的基础上，对如何开发利用该区饲草进行了探讨，指出保护和改善生态环境，积极实行林草结合、种养结合、粮草轮作和发展种草配套养鱼以及调制人工干草制品，是该区丘陵山地发展饲草的有效途径。     

黄土高原沟壑区水平沟覆膜玉米种植试验及效益分析

黄土高原沟壑区水平沟覆膜玉米种植试验及效益分析党发宁（甘肃省正宁县水土保持工作站，７４５３００）黄土高原沟壑区是黄土高原地区的重要地貌类型之一，源、坡、沟、川台、梁峁为其基本地貌单元。区内气候温和，年降水量５５０～６５０ｍｍ，源西土壤侵蚀较轻，沟蚀严...     

Occurrence of endophytes in grasses native to northern China

A survey of grass species associated with Neotyphodium and Epichloë fungal endophytes was made in the permanent grasslands of northern China. A total of 41 grass species, 56 sites and 172 local populations were examined to reveal endophytic infection of native grasses. Twenty‐five of the forty‐one species of grasses (proportionately 0·61) were infected by endophytes: twenty‐two species had a mean infection rate of 0·01–0·50 and only three species had a mean infection >0·50. Of the 172 local populations examined, however, proportionately 0·72 were not infected, 0·181 had an infection rate of 0·01–0·50 and 0·099 had an infection rate of 0·51–1·00. Two genera of grasses, Cleistogenes and Koeleria, as well as twenty plant species, were previously unknown endophytic hosts in China. High infection rates (0·86–1·00) of plants of Achnatherum sibiricum were detected at all eleven sites studied. Other grasses in which high infection rates were found were Agropyron mongolicum, Roegneria turczaninovii, Agropyron elongate, Poa palustris and Poaangustifolia. It was concluded that endophytes are found widely in natural grass populations and that endophyte–grass interactions may have effects on ecosystems and livestock in the grasslands of northern China.     

劣质地条件下肥料树与绿化牧草混植的效应

研究了劣质地肥料树与绿化牧草混植的效应,比较分析了单植与混植、混植密度、施磷肥对于绿化植物生育的影响。结果表明,混植双方的生育受压,肥料树则伴随着根瘤发育不良受压更加明显,这种状况通过采取少量施磷肥可以得到改善。     

异速模型评估森林植被生物量有机碳储量

在孟加拉的吉大港南部森林地区,利用异速模型评估森林植被的有机碳的储量.异速模型被分别应用测试树木(被划分两个胸高直径级)、灌木和草本植物.采用基部面积估算胸高直径级为从> 5 cm 到 ≤ 15 cm 和> 15 cm树木的生物量有机碳储量模型最好,分别有很高的决定系数(胸高直径级> 5 cm 到 ≤ 15 cm 的r2 为0.73697,胸高直径级> 15 cm 的r2为0.87703),且回归系数(P = 0.000)显著.其它模型(包括采用树高,胸高直径,树高和胸高直径,以及综合树高、胸高直径和木材密度)的线性和对数关系都表现出很低的决定系数.分别建立了20种优势树种的异速模型,采用树木基部面积的模型都得到很高的决定系数值.单独采用灌木和草本植物总生物量的异速模型有较高的决定系数(灌木的r2 为0.87948,草本植物的r2 为0.87325),且回归(系数)性显著(P = 0.000).生物量有机碳的评估是复杂的和耗时的研究,本研究所建立的异速模型可以应用于孟加拉和其它热带(地区)国家的森林植被的有机碳储量的测算.     

青岛市园林病虫害管理信息系统的建立

以青岛市园林病虫害为基础数据,应用B—S构架、ASP技术、基于SQL数据库方式建立了数据库信息管理系统。该系统包括青岛园林主要虫害、病害、病虫害预测预报、青岛园林病虫名录、无公害农药知识、园林植保信息等6个方面的子系统。系统采用模糊查询方式,可快速、准确的查询识别病虫害、获得农药防治、预测预报等信息,指导园林绿化。     

观赏蔬菜在园林配置造景中的应用

观赏蔬菜是指一类集食用、观赏、绿化、美化功能于一体的有明确内涵的花卉新类别。它以形态美、色彩美在现代园林绿化中发挥着越来越重要的作用。作者在介绍观赏蔬菜分类的基础上,重点评述了观赏蔬菜在园林配置造景中的应用,并在分析其中存在问题的基础上提出了合理建议,为观赏蔬菜更好地应用在园林设计中提供参考。     

多年生观赏草的生长和繁殖特性研究

对引种的13种观赏草的物候期、生长情况、繁殖特性进行了调查研究并结合引种试验和应用调查对其引种安全性进行了评价.结果表明:13种观赏草均能够在宁波气候条件下正常生长,达到较好的景观效果,而且不存在自播和根系扩张的可能,确保了生态安全.为今后观赏草在长三角地区园林景观中的应用提供了依据.