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上(shang)(shang)水(shui)(shui)(shui)(shui)石(shi)(shi)的(de)(de)實(shi)質是(shi)碳(tan)酸鈣苔(tai)蘚植(zhi)物化(hua)石(shi)(shi)，暄(xuan)而(er)(er)又脆，良好的(de)(de)吸(xi)水(shui)(shui)(shui)(shui)石(shi)(shi)吸(xi)水(shui)(shui)(shui)(shui)性特別強(qiang)(qiang)(qiang)。上(shang)(shang)水(shui)(shui)(shui)(shui)石(shi)(shi)由于暄(xuan)而(er)(er)脆易于造型，可(ke)(ke)隨意鑿槽、鉆洞(dong)(dong)、雕刻出(chu)各(ge)(ge)式(shi)各(ge)(ge)樣的(de)(de)形狀。上(shang)(shang)水(shui)(shui)(shui)(shui)石(shi)(shi)天然(ran)洞(dong)(dong)穴(xue)(xue)很多，有的(de)(de)互相(xiang)穿連通(tong)氣，小的(de)(de)洞(dong)(dong)穴(xue)(xue)如氣孔，這就是(shi)吸(xi)水(shui)(shui)(shui)(shui)性強(qiang)(qiang)(qiang)的(de)(de)主要原因。在上(shang)(shang)水(shui)(shui)(shui)(shui)石(shi)(shi)上(shang)(shang)的(de)(de)洞(dong)(dong)穴(xue)(xue)中，填上(shang)(shang)泥(ni)土可(ke)(ke)植(zhi)花草，大的(de)(de)洞(dong)(dong)穴(xue)(xue)可(ke)(ke)栽(zai)樹木，由于石(shi)(shi)體吸(xi)水(shui)(shui)(shui)(shui)性強(qiang)(qiang)(qiang)，植(zhi)物生長茂盛，開花鮮艷。上(shang)(shang)水(shui)(shui)(shui)(shui)石(shi)(shi)可(ke)(ke)以散發濕氣，用它造假山(shan)或盆景(jing)，都有濕潤環境的(de)(de)作用。

上(shang)水石(shi)(shi)(shi)又(you)稱吸水石(shi)(shi)(shi)，盆中(zhong)蓄(xu)水后，頃刻可吸到(dao)頂端(duan)。石(shi)(shi)(shi)上(shang)可栽(zai)植野草、蘚苔(tai)，青翠蒼潤，為制作(zuo)盆景的佳石(shi)(shi)(shi)。 沙積(ji)石(shi)(shi)(shi)，暄而脆(cui)，但吸水性(xing)很強；石(shi)(shi)(shi)灰石(shi)(shi)(shi)硬度稍高，結構比沙積(ji)石(shi)(shi)(shi)細密。上(shang)水石(shi)(shi)(shi)易于(yu)造型，由于(yu)暄而脆(cui)，可隨意鑿槽、鉆洞(dong)、雕刻出心中(zhong)理想的形象。