I HC QUC GIA THNH PH H CH MINH

KHOA MI TRNGLp: 09KMT

B mn:

GVGD:NGUYN TRNG NGN

Chuyn :

Nhm thuyt trnh:nhm 2

TRNG TUN C TRN TUN ANH L QUAN LC NGUYN VN LM DNG HONG H NGUYN NG HIN KIM MINH HI TRN TH NHUNG HONG NGUYN M LINH NGUYN TRN NH DUY

0917061 0917009 0917186 0917188 0917066 0917099 0917078 0917233 0917164 0917042

NI DUNG CHNHA. M uB. Ni dung I. Nt khi qut 1. Khi nim 2. iu kin hnh thnh & qu trnh hnh thnh

3. Thnh phn & tnh cht4. Phn loi II. Hin trng khai thc v s dng

III. Cc vn mi trngIV. Gii php C. Tng kt

A. M U Mi loi t mang mt s c im ring v c gi tr s dng khc nhau. Do tnh cht m mi loi cy ch thch hp vi mt loi t nht nh nn ngi ta nghin cu tnh cht c im s dng cho ph hp. t ct l loi t c tim nng rt ln v cng nghip v nng nghip

Tuy nhin ti nguyn ny ang b s dng lng ph bt hp l do thiu kin thc ca mt s ngi.

B. NI DUNGI.NT KHI QUT

1. Khi nim Ct l dng vt liu gc t nhin bao gm cc ht v khong vt nh v rt mn. t ct l loi t thuc nhm entisol (cha pht trin). Tuy ngho dinh dng nhng li mang gi tr kinh t ln. t ct ven bin Nam Trung B

2. iu kin v qu trnh hnh thnh iu kin hnh thnh:

Hot ng a cht

IU KIN HNH THNH

Cc qu trnh t nhin

Tc ng ca con ngi

Qu trnh hnh thnh:Theo nghin cu ca cc nh khoa hc, s hnh thnh t ct bin Vit Nam lin quan mt thit n cc hot ng a cht trong khu vc. t ct ven bin c hnh thnh t 2 qu trnh chnh.Qu trnh nng cao b bin: Nng cao b bin l hin tng ph bin, iu ny chng t qu trnh nng cao b bin Trung B trc y l mt qu trnh to nn nn ca ng bng ct ven bin ngy nay: bng chng l cc bi s Din Chu (Ngh An) .

Bi s Din Chu( Ngh An)

Qu trnh bi t to lp:

Do cc yu t sau: a hnh gm 2 loi chnh: bi t, xi mn

nh hng trc tip thng qua cc c trng nh cao, dc nh hng gin tip thng qua yu t kh hu v sinh vt . S bi lp Sng ngi vn chuyn vt liu trm tch

Th nhng v v phong ha:

C s th nhng v cc lp trm tch ca v phong ha: t ct bin pht trin trn m cn bn l ct nn ri rc,ngho dinh dng Phn b cc lp th nhng: gy ra bi qu trnh trm tch phc tp, di nhng iu kin nht nh. Du vt hot ng ca con ngi: Khi dng, chuyn dng, p p ngn nclm thay i thnh phn th nhng ca t. nh hng ca ch nhit m: Tc ng n cc qu trnh phong ha, ra tri, xi mn v bi t vng t ct bin.

3. Thnh phn v tnh chta) Thnh phn: - t ct bin nh, t l ct chim ti (85% 90%). - t ct b ri, th, mu vng, trng hay xm - Hm lng silic cao, st v limon thp (0% - 6%). - N, P, K v lng mn rt thp. - pH dao ng ty ni khong 4,5 7,5.

b) Tnh cht: Tnh cht vt l: - t ct bin c thnh phn c gii nh, c bn l ct, trong hm lng ct mn rt cao (71% - 94%), hm lng st thp (10% - 15%). Ct ch yu l quartz, ngoi ra cn c cc ht c nh vi, mica thch cao-

- Dung trng ca t ct bin 1,4 1,7g/cm3 , t trng (2,6 2,7). xp khong (35% - 45%). m khong (2,5% - 12.5%).

Tnh cht ha hc:

- Hm lng silic rt cao (70% - 90%). Hm lng Fe2O3(1,2% 9,7%);MnO (0,08%-1,13%);Na2O95%)

- Ti xp, ri rc, khng c kt cu, thm thot nc nhanh.- t t chua, c ph nhiu rt thp, kh nng gi nc v gi cc cht dinh dng km. - N, P, K v cc cation trao i u rt ngho. - Gi tr CEC ca t rt thp (thp nht trong cc loi t Vit Nam) ch t mc xp x 1 ll/100g t. - Hm lng OC% trong t rt thp, thng