以海洋微藻四列藻(Tetraselmis tetrathele)为试验材料,在试验前阶段,置于设定的多种低盐度和高盐度胁迫条件下培养10d,在试验后阶段,将各处理组盐度恢复至正常(35),并将该藻置于此条件下培养10d。在藻恢复生长阶段,发现盐度为15的低盐处理组和盐度为100的高盐处理组与持续在正常盐度(35)条件下培养的对照组比较,处理组有更强的生长能力(P<0.05),主要表现为在恢复生长的中后期(6～8d),藻细胞平均相对生长率提高,细胞数增多,叶绿素a含量和生物量增高。同时,对于盐度条件的变化,藻细胞能通过细胞内蛋白质、糖含量的相应改变,来启动渗透调节机制以维持正常的生理机能。试验表明,四列藻继盐胁迫后的培养过程中,具有超补偿生长的特性。

Degradation of three herbicides, atrazine, cyanazine and dicamba, was assessed in laboratory microcosms incubated under simulated methanogenic conditions using sediment from Pearl River of Southern China as an inoculum. Atrazine was much more resistant to degradation than cyanazine and dicamba over 300 days of incubation. Biodegradation of cyanazine and dicamba was further substantiated by establishment of enrichment transfer cultures in which the degradation of the respective herbicide was accelerated by the active microorganisms. Degradation of cyanazine initially involved the removal of chlorine and the two side chains, while that of dicamba was O-demethylation reaction forming 3, 6-dichlorosalicyclic acid. Results suggest that biodegradation of xenobiotics can be established through enrichment culture transfer technique, and further mechanism of degradation and microorganisms involved can be elucidated.

通过对眼点拟微绿球藻和扁藻进行共培养试验,结果表明,在共培养条件下,眼点拟微绿球藻和扁藻的生长速度均受到抑制,即两种藻的最大生长密度均比对照（分别单独培养）有显著降低,而且眼点拟微绿球藻降低的程度要大于扁藻。经计算两种藻的种间竞争系数可知,扁藻的种问竞争能力明显强于眼点拟微绿球藻。

Based on the investigation data and relevant statistical data recently, with the methods of principle components analysis and cluster analysis, the present situation of grassland agriculture development and its sustainable degree of 30 poor counties located in karst mountains of Guangxi, Yunnan and Guizhou Provinces was studied. In the light of universal situation of the 30 poor counties, the index system of population, resources, environment, social and economic development for evaluating the sustainability degree of the local grassland agriculture system were determined preliminarily. By analyzing and calculating, the comprehensive index of grassland agriculture system sustainability of every county among the 30 poor counties have been obtained, and the comprehensive classification, order and evaluation for the present sustainable development degree of the 30 poor ones have been carried out.

论述了农业生态系统的能量流动物质循环原理、系统相关原理、相生相克原理、忍耐极限原理、结构功能原理、系统开放原理、限制因子原理、非加和原理、生物竞争原理和竞争排斥原理；认为中国生态农业是一种较为典型的可持续发展的农业系统类型,建议在国家持续农业发展进程中要积极推行生态农业,