利用山地小气候优势搞好春播育秧

俗话说:“种稻要好秧”,“秧好半季稻”,搞好春播育秧对于夺取早稻丰收,乃至对全年农业生产丰收占有十分重要的地位。而春播期气温变化剧烈,常遇低温阴雨,对春播育秧造成很大困难和威胁,轻者停滞生长,叶尖发黄,重者烂秧死苗。如1972年4月初受冷空气低温阴雨影响,全县损失谷种二十多万斤,这不仅造成谷种紧张,需补种补苗,而且推迟了农事季节。但我们在调查中     

我县烂、旱冬和春雨的气候特点及其对大小麦产量影响

我县是丘陵山区,除部分高山社队外,大部推广麦、稻、稻三熟制,其中大小麦面积约五万亩,占全县耕地面积近四分之一。所以搞好春粮生产,对于夺取粮食全年丰收很有意义。但从当前大小麦亩产情况来看,产量不稳定,增减幅度大,如73年75年小麦产量,就较上年分别下降七十一斤与一百三十五斤,影响了社员生产积极性。近年来,我们以“烂冬油菜,旱冬麦”的群众经验为线索,以实际产量为依据,认为影响麦子产量的因素固然很多,但气象条     

天然避暑胜地——缙云仙都周村透气洞

仙都素以奇峰异石的自然景观与众多摩崖石刻的人文景观闻名于世。有半地拔起天下第一峰的“石笋”,有形貌酷似的“婆媳岩’,有似锦如画的“赤壁蓬莱”,有古迹留芳的“倪翁洞”,还有宏伟壁垒的“铁城”等等……。然而,来仙都的游客,却很少知道,仙都著名景点婆媳岩下,还有一处天然避暑胜地——周村透气洞。 周村透气洞,座落在缙云城东周村的南端山脚下,站在缙云火车站可清晰相望。从县城出发,沿五壶公路下车于官店村,然后越过两座石板桥到周村,再往东走500米,即可见山脚     

用多因子综合法作山林火险预报

缙云县地处浙南丘陵山区,全县“八山-水-分田”,山林面积一百七十万亩,具有丰富的林业资源和广阔的发展前景。但是近年来,我县山林火灾事故频繁,许多宝贵的森林资源和生态环境遭到了破坏。然而,山林火灾的发生发展、与前期及当时的气象因素有着密切的相关,即在适宜的气象条件下,一旦遇有火源,山林就易着火,甚至蔓延成灾;但若气象条件不适宜,即使有较强的火源,山林也不易着火成灾。现将预报方法介绍如下:     

浙江缙云县大洋山石鼓尖花岗岩坑穴成因

On top of Shigujian Peak (1477 m a.s.l.) of the Dayangshan Mountain in Jinyun County, Zhejiang Province, large amounts of granite pits with diameters ranging from several dozens of centimeters to around one meter and depth from 10 cm to 45 cm are found on rock surface. These pits mainly appear on the NE and SE sides, and their drainage mouths are in the same direction. The identification results through micropolariscope and X-ray fluorescence spectrometer reveal that bedrock of pits is from middle to fine-grained moyite being apt to be weathered and modified. In Dayangshan region the annual mean temperature is 9.2°C and annual precipitation is over 1700 mm. On the one hand, there always experiences a period of periglacial action with temperature oscillating near 0°C for 4 months, i.e., from December to March next year. As a consequence, the freezing-thawing cycles may be remarkable to disintegrate the bedrock. On the other hand, the windward slope of Shigujian Peak meets typhoon of over force 10 on the Beaufort scale in summer, therefore, the blowing makes suspending sands or pebbles grind in swirling form. Based on field investigation and periglacial geomorphic theory, the pits on top of Shigujian Peak are attributed to freezing-thawing of periglacial action. Meanwhile, storm and strong wind accelerate the process. Observation shows that both the actions are still undergoing and variant directions of wind are the main cause for making different shapes of the pits. Because the top of Shigujian is 1500 m lower than the present snow line, some scholars considered that “glacial pothole” formed in the Quaternary is hard to work, even though in the Last Glacial Maximum (LGM). Foundation: Regional landform and landscape survey programme of the Zhejiang Institute of Geological Survey Author: Zhu Cheng (1954–), Professor, specialized in geomorphology and the Quaternary geology.     

浙江缙云县大洋山石鼓尖花岗岩坑穴成因

浙江缙云县大洋山石鼓尖海拔1477m,在其山顶花岗岩表面发现大量直径几十厘米至1m左右、深度10cm至45cm的坑穴。经对60处坑穴的形态量测发现,坑穴主要发育在山坡的NE和SE一侧;坑穴积水后出水口流向亦主要朝向NE和SE。对岩石标本的偏光显微镜和X荧光光谱鉴定分析发现,该处基岩为易风化、泥化明显的中细粒钾长花岗岩。该处年平均气温9.2oC,年降水量在1700mm以上,每年12月至翌年3月会经历4个月日气温在0oC上下波动的冰缘作用期,雨雪水冻融交替对基岩的崩解作用明显。该处位于夏季台风雨迎风坡（NE和SE坡）一侧,暴雨常伴随有10级以上大风。现场常可见风力吹蚀带动坑穴中细岩屑对坑穴内壁产生加速旋转磨蚀作用。上述研究表明,该处花岗岩坑穴形成的主要动力成因首先是冰缘寒冻风化作用,暴雨和山顶大风的风力吹蚀加速了坑穴的形成。观察表明,此种作用目前仍在进行之中,风向的转变是造成坑穴出现多种形态的主要原因。由于此处海拔距雪线尚有1500m高差,即使在第四纪盛冰期也仅是接近雪线高度,且因山顶无积雪屯冰的低洼地形,因此,第四纪“冰臼”成因说难以成立。