首页
登录
职称英语
Soil quality is one of the most basic and perhaps least understood indicato
Soil quality is one of the most basic and perhaps least understood indicato
游客
2023-11-18
37
管理
问题
Soil quality is one of the most basic and perhaps least understood indicators of land health. Soil supports plant growth and represents the living reservoir that buffers the flows of water, nutrients, and energy through an ecosystem. Soil quality refers to the capacity of a soil to perform these beneficial functions and is determined by its texture, structure, water-holding capacity, porosity, organic matter content, and depth, among other properties. Because soils naturally vary in their capacity to perform these functions, we must tie our understanding of soil quality to landscapes and land use. We must understand soil quality for two important reasons: First, we must match our use and management of land to soil capability. Second, we must establish baseline understanding about soil quality so we can recognize ongoing trends. If soil quality is stable or improving, we have a good indicator that the ecosystem is sustainable. If soil quality is deteriorating, the larger ecosystem will almost certainly decline with it.
People describe soil types in all kind of ways such as beavy, light, sandy, clay, loam, poor or good. Soil scientists describe soil types by how much sand, silt and clay is present. This is called texture. It is possible to change the texture by adding different things to the soil. You can roughly estimate the texture of a soil by a simple method called" manual texturing", through determining the feel of a moist sample when robbed between the thumb and forefinger. If the soil sample is predominantly sand, it will feel very gritty, If it is predominantly silt, it will feel smooth or slippery to the touch. And if it’s predominant clay, it will feel sticky.
Particle size has a lot to do with a soil’s drainage and nutrient holding capacity. Sand is the largest particle and doesn’t hold many nutrients. Silt is a soil particle whose size is between sand and clay. When wet, silt feels smooth, but not sticky. Clay is smooth when dry and sticky when wet. Soils high in clay content are called heavy soils. Clay also can hold a lot of nutrients, but doesn’t let air and water throuhgh it well. To better understand how big these three soil particles are, think of them like this. If a particle of sand were the size of a basketball, then silt would be the size of a baseball, and clay would be the size of golf ball. [br] A soil that is predominantly silt
选项
A、will indicate high soil quality.
B、will be called a heavy soil.
C、will be smooth but not sticky when moist.
D、will be difficult to use in the "manual texture" method.
答案
C
解析
细节题。第二段提到"If is predominantly sit, it will feel smooth or slippery to the touch.",故正确答案是C
转载请注明原文地址:https://tihaiku.com/zcyy/3198038.html
相关试题推荐
Sincewearesocialbeings,thequalityofourlivesdependsinlargemeasu
Insomecountries,______iscalledequalitydoesnotreallymeanequalrightsf
Qualityis______countsmost.A、whichB、thatC、whatD、whereC表语从句题。句中is后为表语从句,该从
Theoldmanwassoangryandspokesofastthatnoneofhischildrenunderstood_
Ihavenoimpression______hewenthome,perhapsbybike.A、howB、whetherC、whenD
Thefuzzy,overstuffedqualityofnineteenthcenturyproseresultedfromusingt
Howstricttutorsarewiththeirpupils______astrongimpactonthequalityof
Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals
Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals
Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals
随机试题
1.说明:根据下列信息写一张借据。时间:7月25日内容:英语系学生会向系办公室借SANYO牌录音机一台,言明7月29日归还。
[originaltext]WhatcanIdoforyou,madam?[/originaltext][audioFiles]2019m8x/
A.血寒证 B.阴虚证 C.阳虚证 D.血热证 E.亡阳证因行经期下水劳
滋润内燥方一般较少配伍A.甘寒生津药B.甘温益气药C.咸寒润肠药D.辛香淡渗药E
中麻黄膜质鳞叶的特征是A.裂片2,先端不反曲 B.裂片4,锐三角形,先端反曲
A.后带B.等价带C.前带D.前带或后带E.前带和等价带抗体过剩时称为
患者女性,左腰部被撞伤1小时,因左腰痛、尿红色来院就诊。查体:BP120/70m
(2020年真题)进口设备重量为1000吨,离岸价格FOB为200万美元,海运费
(2021年真题)根据《标准材料采购招标文件》,材料采购投标文件中应包括的内容有
沥青混合料压实机械有:静力式钢轮压路机、( )、振动压路机。A.羊足轮碾压机
最新回复
(
0
)