第600章 蝗灾来了
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在干旱的年份，由于水位下降，土壤会变的较为坚实、含水量降低，地面的植被稀疏，蝗虫产卵数会大为增加，多的时候一平方米能有二十到四十万粒卵。龙腾小说ltxsba.com
而且干旱年份，河、湖水面缩小、低洼地裸露，也为蝗虫提供了更多适合产卵的场所，另一方面，干旱环境生长的植物含水量低，蝗虫以此为食，生产更快。干旱还会使得蝗虫迁徙，结成更大的蝗虫群，导致大型蝗灾。
不过古人对于蝗虫的认知不多，反而有蝗神的说法，遇蝗灾还要拜蝗神。又有蝗鱼互化的说话，说蝗是鱼卵所化，称旱涸则鱼、虾子化为蝗，故多鱼兆丰年。还说蝗虫飞入海，化为鱼虾。
不过对于当政的人来说，蝗虫，尤其是旱年之后的蝗灾，那是最可怕的。
按官方的史料所记载，秦汉之时，蝗灾几年是平均8.8年就爆发一次。而到了隋唐之时，差不多五年左右爆发一次，到两宋时，三年半就爆发一次，元代一点六年一次，明清二点八年一次。
蝗灾迭起，受灾的地方多集中在中原河北、河南、山东三省。在江淮和江汉地区亦有分布，严重的时候，关中地区也会爆发，甚至会遍及整个黄土高原。
而最容易爆发蝗灾的地方，还是黄河游戏，尤其是中下游流域，每当大水泛滥之后，就接着会是严重的旱灾。水旱灾交替发生，就会使得沿湖、滨海、河泛、内涝地区出现许多大面积的荒滩和抛荒地。
而这些地方，往往就成为了蝗灾发生并猖獗的条件。
这些都是后人早就熟知的常识，但对于这个时代的多数古人来讲，他们都搞不明白蝗虫发生的原因。
只是一味的认为蝗虫是没有规律可言的，是上天的责罚等等。
黄河的河滩地，其实就是蝗虫最大的产卵区。如果黄河的河滩每年有几次河水漫滩，那么蝗虫数量就会大大减少，五月河水漫滩六月退水，会减轻夏蝗发生程度。七月上水，八月退水，则秋蝗发生面积最小。
如果八月以前上水退水，则秋蝗会退水产卵，来年夏蝗则偏重发生。
由于黄河断流时间一般都是七八九月的夏秋季和二到六月的春夏季，这期间正好是飞蝗发育和繁殖期，河断的断流直接影响到中原等省黄河滩地飞蝗的发生动态。
基本上，如果黄河断流，有百分之七十以上的机率会发生蝗灾。
“你说黄河断流，就会发生蝗灾？”
李世民和宰相们本来吃蝗虫吃的挺开心的，结果李超却说了一个让大家开心不起来的话题。
“蝗灾，好像有好几年没发生了。”萧瑀也道。
李超搬了个椅子坐在李世民身边，“陛下，据我对史书上蝗灾的统计和研究，秦汉之时，几乎每不到九年，就会爆发一次大蝗灾。而到了近三百年，则是差不多每不到六年就要爆发一次大蝗灾。”
李世民面色沉了下来。
蝗灾几乎年年有，但大蝗灾，那必然会是席卷数十州县，能让无数人流离失所的大灾情。这样的大蝗灾，上一次，好像就是在六年前。
“六年一次，大蝗灾已经六年未发生过了，大唐建立至今，还未发生过大蝗灾。难道说，明年要发生大蝗灾？”李世民说出这话的时候，声音里甚至都有一点颤抖。
明年，是他改元之年，明年就正式改用贞观年号了。
贞观，那是他的年号。
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