土壤孔隙度与容重
土壤容重及孔隙度的计算: (1)环刀容积的计算V (环刀容积)=πr2h 利用卷尺量出数据式中:π= r= 环刀半径h= 环刀高度(去掉底盖和上盖) (2)土壤容重的计算土壤容重=(M-G)*100/V(100+W) 式中:M=(环刀+湿土)重量(g) G= 环刀(底盖+上盖)重量(g) V= 环刀容积(cm3) W= 土壤含水量(%) (3)土壤孔隙度的计算土壤孔隙度=(1-土壤容重/土壤密度)*100% 式中:土壤密度采纳密度值cm3 判断土壤松紧度: 土壤容重松紧程度< 过松—略微松—适合—略微紧> 过紧tu rang rong zhong ji kong xi du de ji suan : ( 1 ) huan dao rong ji de ji suan V ( huan dao rong ji ) = π r 2 h li yong juan chi liang chu shu ju shi zhong : π = r = huan dao ban jing h = huan dao gao du ( qu diao di gai he shang gai ) ( 2 ) tu rang rong zhong de ji suan tu rang rong zhong = ( M - G ) * 1 00/ V ( 1 00+ W ) shi zhong : M = ( huan dao + shi tu ) zhong liang ( g ) G = huan dao ( di gai + shang gai ) zhong liang ( g ) V = huan dao rong ji ( c m 3 ) W = tu rang han shui liang ( % ) ( 3 ) tu rang kong xi du de ji suan tu rang kong xi du = ( 1 - tu rang rong zhong / tu rang mi du ) * 1 00% shi zhong : tu rang mi du cai na mi du zhi c m 3 pan duan tu rang song jin du : tu rang rong zhong song jin cheng du & l t ; guo song —lve wei song —shi he —lve wei jin & g t ; guo jin
tu rang rong zhong he kong xi du deng can shu jue ding tu rang de dao shui xing 、bao shui xing 、tou qi xing deng , zhe xie dou yu zhi bei sheng chang mi qie xiang guan , shi ping jia tu rang zhi liang de zhong yao zhi biao 。li ru yi ban nong tian biao ceng tu rang de rong zhong wei 1 . 2 zuo you , rong zhong tai gao bu li yu zuo wu gen xi sheng chang 。ben wen dang wei 【tu rang rong zhong de ce ding ji zong kong xi du de ji suan W o r d wen dang 】,qing shi yong ruan jian O F F I C E huo W P S ruan jian da kai 。zuo pin zhong de wen zi yu tu jun ke yi xiu gai he bian ji ,tu pian geng gai qing zai zuo pin zhong "
本文档为【土壤容重的测定及总孔隙度的计算Word 文档】,请使用软件OFFICE或WPS软件开。作品中的文字与图均可以修改和辑,更改请在作品中即土壤孔隙容积占土体容积的百分比。土壤中各种形状地粗细土粒集合和排列成固相骨架。骨架内部有宽狭和形状不同的孔隙,构成复杂的孔隙系统,全部孔隙容积与土体容积的百分率,称为土壤孔隙度。
tu rang kong xi du nan yi zhi jie ce ding ,yi ban tong guo tu rang bi zhong yu rong zhong jian jie qiu de :tu rang kong xi du (% )= (1 —rong zhong / bi zhong )* 1 00% 。bu tong tu rang he bu tong tu ceng de kong xi du bu tong ,zhu yao shou tu " 土壤容重与孔隙度对土壤肥力的关系如下:土壤容重和孔隙度等参数决定土壤的导水性、保水性、透气性等,这些都与植生密切相
土壤孔隙度难以直接测定,一般通过土壤比重与容重间接求得:土壤孔隙度()(1 —容重/比重)100%。不同土壤和不同土层的孔隙度不同,主要受土tu rang rong zhong yu kong xi du dui tu rang fei li de guan xi ru xia :tu rang rong zhong he kong xi du deng can shu jue ding tu rang de dao shui xing 、bao shui xing 、tou qi xing deng ,zhe xie dou yu zhi bei sheng chang mi qie xiang
ji tu rang kong xi rong ji zhan tu ti rong ji de bai fen bi 。tu rang zhong ge zhong xing zhuang di cu xi tu li ji he he pai lie cheng gu xiang gu jia 。gu jia nei bu you kuan xia he xing zhuang bu tong de kong xi , gou cheng fu za de kong xi xi tong , quan bu kong xi rong ji yu tu ti rong ji de bai fen lv , cheng wei tu rang kong xi du 。土壤容重和孔隙度等参数决定土壤的导水性、保水性、透气性等,这些都与植生密切相关,是评价土壤质量的重要指标。例如一般农田表层土壤的容重为1.2左右,容重太高不利于作物根系生。