The effects of land use and its patterns on soil properties in a small catchment of the Loess Platea

来源 :Journal of Environmental Sciences | 被引量 : 0次 | 上传用户:dxcnet2009
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Due to relatively strong human activities in the hilly area of Loess Plateau, the natural vegetation has been destroyed, and landscape pattern based on agricultural land matrix was land use mosaic composing of shrub land, grassland, woodland and orchard. This pattern has an important effect on soil moisture and soil nutrients. The Danangou catchment, a typical small catchment, was selected to study the effects of land use and its patterns on soil moisture and nutrients in this paper. The results are as follows: The comparisons of soil moisture among seven land uses for wet year and dry year were performed: (1) the average of soil moisture content for whole catchment was 12.11% in wet year, while it was 9.37% in dry year; (2) soil moisture among seven land uses was significantly different in dry year, but not in wet year; (3) from wet year to dry year, the profile type of soil moisture changed from decreasing type to fluctuation-type and from fluctuant type to increasing type; (4) the increasing trend in soil moisture from the top to foot of hillslope occurred in simple land use along slope, while complicated distribution of soil moisture was observed in multiple land uses along slope. The relationships between soil nutrients and land uses and landscape positions were analysed: (1) five nutrient contents of soil organic matter (SOM), total N (TN), available N (AN), total P (TP) and available P (AP) in hilly area were lower than that in other areas. SOM content was less than 1%, TN content less than 0.07%, and TP content between 0.05% and 0.06%; (2) SOM and TN contents in woodland, shrub land and grassland were significantly higher than that in fallow land and cropland, and higher level in soil fertility was found in crop-fruit intercropping land among croplands; (3) soil nutrient distribution and responses to landscape positions were variable depending on slope and the location of land use types. Due to relatively strong human activities in the hilly area of ​​Loess Plateau, the natural vegetation has been destroyed, and landscape pattern based on agricultural land matrix was land use mosaic composing of shrub land, grassland, woodland and orchard. This pattern has an important effect on soil moisture and soil nutrients. The Danangou catchment, a typical small catchment, was selected to study the effects of land use and its patterns on soil moisture and nutrients in this paper. The results are as follows: The comparisons of soil moisture among seven land uses for wet year and dry year were (1) the average of soil moisture content for whole catchment was 12.11% in wet year, while it was 9.37% in dry year; (2) different in dry year, but not in wet year; (3) from wet year to dry year, the profile type of soil moisture changed from decreasing type to fluctuation-type and from fluctuant type to increasing type; (4) the i ncreasing trend in soil moisture from the top to foot of hillslope occurred in simple land use along slope, while complicated distribution of soil moisture was observed in multiple land uses along slope. The relationships between soil nutrients and land uses and landscape sites were analysed: ( 1) five nutrient contents of soil organic matter (SOM), total N (TN), available N (AN), total P (TP) and available P (AP) in hilly area were lower than that in other areas. SOM content was less than 1% TN content less than 0.07%, and TP content between 0.05% and 0.06%; (2) SOM and TN contents in woodland, shrub land and grassland were significantly higher than that in fallow land and cropland, and higher level in soil fertility was found in crop-fruit intercropping land among croplands; (3) soil nutrient distribution and responses to landscape positions were variable depending on slope and the location of land use types.
其他文献
广告大师大卫·奥格威运用“破坏”手段为哈撒韦衬衫做广告时,把一只黑色而又丑陋的眼罩戴在男模特的眼上,破坏了男模特固有的英俊,却为哈撒韦衬衫树立了独特的个性,使其脱
The laser cooling of ytterbium(Yb) atoms needs a 399-nm laser which operates on the strong1S0-1P1 transition and can be locked at the desired frequencies for di
自2004年香港版《金枝欲孽》热播以来,一波接着一波的“女性宫斗剧”长期占领银幕,其代表作《后宫·甄嬛传》更是填补了国产电视剧不能进入美国主流市场的空白,创造了国产电
吕先生写过很多语言学论著,对中国语言学的发展影响深远。《语法修辞讲话》是吕老与朱德熙先生在新中国成立初期合著的一部影响很大的普及性著作,目的在于纠正当时社会上使用
《中国好人》(山西人民出版社2009年2月出版)第164页有句话说,王阳明37岁时,“被谪在贵州龙场驿,某夜睡梦中大悟,像欧几里得一样跳起来,大叫我知道了”。笔者想指出的是,“跳
有经济学家认为,现代市场经济正由产品型经济向服务型经济转变。对当今信息化社会中的传统媒体而言,能否实现新闻从产品型向服务型的转变,是决定其市场竞争力的关键。 身为
Reliable evaluation of in-situ stress is an important issue for the analysis and design of undergroundexcavations,particularly for evaluating the stability of
网络语言世界中有一种极致化表达的倾向,任何事情都要用上表示强烈程度的词语或句式,可谓“语不惊人死不休”!我们不妨模拟网民的口气来写一段:今早,地铁挤爆了,都把我挤出翔
一、概论1、问题的提出根据1970年至1983年的资料,全国煤矿所发生的重大瓦斯、煤尘爆炸事故主要发生在采区,其中发生在掘进工作面的占60%以上。在1972年至1983的12年中,我局
我国自80年代末以来利用航天育种选育出513个新品种,占世界航天育种总和的四分之一,每年为农业增产30-40亿公斤粮食。 据了解,我国自1987年以来,利用返回式卫星搭载种子,在地面选育出一批高产、