Determination of cover management factor (C-Factor) in agricultural lands and its relationship with NDVI

Abstract

Cover and management factor (C-factor), in USLE (Universal Soil Loss Equation) and RUSLE (Revised Universal Soil Loss Equation) technologies, states protective effect against soil losses by water erosion. In terms of managing land and soil, Sustainable Land and Soil Management should take place in agricultural lands. Hence, C-factor expresses the effect of the plant and the soil cover, showing a relationship between soil losses and bare soils and diverse soil surface conditions including vegetation cover during plant development period. This condition presents how mitigation measures affect soil losses annually and how soil losses affect crop rotation and other management plans, reciprocally. The aim of this research is to examine the relationships between C-factor and NDVI and investigate the spatial and temporal practicality of the NDVI as a remote sensing tool over large areas. Sub-factors of the C factor –prior land use, soil roughness, soil moisture, canopy cover and surface cover- were determined directly from sample points designed systematically and randomly in the sugar beet planted-study area and average C-factor was 0,060 (±0,070). NDVI values were obtained by using portable spectro-radiometer for in-situ measurements and calculated from the satellite data (Pleiades) and average NDVI values were 0.6212 (±0.042) and 0.6209 (±0.0258), respectively. With the interactive regression analysis among methods, the spatial and temporal changes on the land cover patterns and their effects on soil loss were rapidly determined in the semi-arid watershed of Eskisehir.

Keywords

• C-factor,NDVI,remote sensing,geo-statistics

Tarım Arazilerinde Bitkisel Örtü ve Ürün Yönetimi Faktörünün (C-Faktörü) Belirlenmesi ve NDVI ile İlişkisi

Öz

Bitkisel örtü ve ürün yönetimi faktörü (C-faktörü), hem Evrensel Toprak Kaybı Eşitliği (ETKE) hem de Yenilenmiş Evrensel Toprak Kaybı Eşitliği (YETKE) teknolojisinde yağışların meydana getirdiği toprak kayıplarına karşı koruyucu bir etkiyi ifade etmektedir. Sürdürülebilir arazi ve toprak yönetimi açısından koruyucu bitkisel örtünün yıl içerisindeki değişiminin belirlenmesi gerekmektedir. Dolayısıyla bu faktör, bitki gelişme dönemi boyunca koruma planlarının yıllık toprak kaybına etkisini, toprak kaybının ürün münavebesini ve diğer yönetimsel planları nasıl etkilediğini göstermektedir. Bu çalışmadaki amaç, NDVI (Normalleştirilmiş fark bitki örtüsü indeksi) ve C-faktörü arasındaki ilişkileri araştırmak ve C-faktörünün belirlenmesinde uzaktan algılama yöntemiyle belirlenen bitki örtüsü indeksinin kullanımının önemini incelemektir. Pancar bitkisi ekili parselde, ölçümler uydu görüntüleriyle yersel ölçümlerin eş zamanlı olduğu, sistematik ve rastlantısal örnek noktalarında gerçekleşmiştir. YETKE-C değişkenleri -önceki arazi kullanım, toprak pürüzlülüğü, toprak nemi, kanopi kapalılığı ve yüzey kapalılığı- ölçümü ile C-faktörü belirlenmiş ve ortalama C-faktörü 0,060 (±0,070) olarak bulunmuştur. NDVI değerleri ise hem portatif spektroradyometreyle yersel ölçümlerden hem de uydu görüntülerinden (Pleiades) hesaplanarak elde edilmiştir. NDVI değerleri sırasıyla 0,6212 (±0,042) ve 0,6209 (±0,0258) dur. Bu türdeki bağlantısal çalışmalarla, konumsal ve zamansal olarak yarı-kurak Eskişehir koşullarındaki havzalarda arazi örtü desenlerindeki değişimler ve toprak kayıpları üzerine olan etkileri daha çabuk bir şekilde belirlenebilecektir.

Anahtar Kelimeler

• C-faktörü,NDVI,uzaktan algılama,jeo-istatistik.

Kaynakça

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