Agro-ecological studies on the ecosystem of field crops in arid lands

干旱和半干旱地区面积极大，占地球陆地面积的28%。除特定地区外，这些地区的植物栽培技术水平明显较低。我们的研究旨在科学地厘清这些地区耕地生产率的上限和影响生产率的因素。下加利福尼亚半岛属于以北纬30度为中心的半热带高空大气带，位于锋面的南北界之间。此外，为了防止加州海流流入半岛以南的太平洋近海，导致洋流上方的大气层温度降低。随后，虽然湿度较高，但出现了几乎不下雨的沿海沙漠气候。在黎明前的日最低温度时，湿度会达到90%。相反，土壤表层和植物叶片的放置对…有影响更多的是通过辐射冷却，在风速合适的情况下，它们的温度比大气层温度低2到3摄氏度或低于露点。因此，它们的表面形成了露水。每100 cm~2露量近2~3g，在半干旱或干旱荒漠地区可作为水资源积极利用。此外，露水被认为对自然生长的植被也有很大影响。通过掺入土壤持水物质作为限水栽培，进行了几种蔬菜栽培。结果表明，格雷罗黑人在蔬菜栽培上具有较高的生产潜力。农业是受自然影响较大的本土或本土产业。因此，仅用2-3年的试验数据来讨论这些地区的农业耕作方式是否适用或是否合适是非常危险的。努力增加重复种植同一种或多种蔬菜的试验次数，以尽可能减少非常危险的情况。无论如何，根据国外的学术研究，由于时间的限制，有些事情是我们必须匆忙作出结论的，不知何故，带着遗憾。较少

Arid and semi-arid regions are extremely huge, amounting to 28% of lands in the Earth. Technologies of plant-cultivation in these areas are markedly at low level except for in particular regions. Our research was aimed at clarifying scientifically an upper limit of both productivity in ploughed fields in these areas and factors retarding the productivity. The Baja California Peninsula belongs to a semi-torrid high atomospheric zone, centering in latitude 30 N and is located in between a nothern limit and southern one of the front. Furthermore, in order that the California Sea Current flowing in to an offshore of the Pacific Ocean south of the peninsula, causes temperature in an atomosphere over the ocean current to diminish. Subsequently, although humidity is relatively high, the coastal desert climate in which it scarcely rains occurs. At a time of daily minimum temperature before daybreak it becomes 90% in humidity. On the contrary, soil-surface and leaves of plant are put influences … More on by radiant cooling, and in a case of feasible wind rate their temperatures get lower by 2 to 3 c than the atomospheric temperature or become below a dew point. Thus dew formed on their surfaces. The amount of dew is nearly 2 to 3g per 100 cm^2. The quantity is considered to be utilized positively as water-resource in the semi-arid or arid desert. Moreover, the dew is thought to have great influences on naturallygrowing vegetation as well. Several sorts of vegetable-cultivation were performed by mixing in the soil water-holding substance as water-limiting cultivation. Such result was gotten that Guerrero Negro had potentially high productivity related to vegetable-cultivation. Agriculture is native or indigenous industry affected great influences by nature. Therefor, it is very dangerous to discuss whether or not ways of the cultivation in agriculture in those regions are adaptable or appropriate with only the experimental data collected for 2 to 3 years. Efforts to rising the number of the test in which the cultivations of the same or vegetables were repeated, were made to minimize the very danger as much as possible. Anyhow, it would be added that there are affairs that we must hurry up to make conclusion, somehow with a regret, owing to limitation retative to time depending on the overseas academic research. Less