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| Titel |
Evaluation of soil fertility in the succession of karst rocky desertification using principal component analysis |
| VerfasserIn |
L. W. Xie, J. Zhong, F. F. Chen, F. X. Cao, J. J. Li, L. C. Wu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 2 ; Nr. 6, no. 2 (2015-05-21), S.515-524 |
| Datensatznummer |
250115447
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| Publikation (Nr.) |
 copernicus.org/se-6-515-2015.pdf |
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| Zusammenfassung |
| Expanding of karst rocky desertification (RD) area in southwestern China is
strangling the sustainable development of local agricultural economy. It is
important to evaluate the soil fertility at RD regions for the sustainable
management of karst lands. The changes in 19 different soil
fertility-related variables along a gradient of karst rocky desertification
were investigated in five different counties belonging to the central Hunan
province in China. We used principal component analysis method to calculate
the soil data matrix and obtained a standardized integrate soil fertility
(ISF) indicator to reflect RD grades. The results showed that the succession
of RD had different impacts on soil fertility indicators. The changing trend
of total organic carbon (TOC), total nitrogen (TN), available phosphorus, microbial biomass carbon (MBC), and microbial biomass nitrogen (MBN)
was potential RD (PRD) > light RD (LRD) > moderate RD
(MRD) > intensive RD (IRD), whereas the changing trend of other
indicators was not entirely consistent with the succession of RD. The
degradation trend of ISF was basically parallel to the aggravation of RD,
and the strength of ISF mean values were in the order of PRD >
LRD > MRD > IRD. The TOC, MBC, and MBN could be
regarded as the key indicators to evaluate the soil fertility. |
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